diff --git a/src/Orchard.Specs/Hosting/Orchard.Web/Web.config b/src/Orchard.Specs/Hosting/Orchard.Web/Web.config
index 6a25dc025..cc0dfbd39 100644
--- a/src/Orchard.Specs/Hosting/Orchard.Web/Web.config
+++ b/src/Orchard.Specs/Hosting/Orchard.Web/Web.config
@@ -62,6 +62,7 @@
         <add extension=".csproj" type="Orchard.Environment.Extensions.Compilers.CSharpExtensionBuildProviderShim"/>
       </buildProviders>
       <assemblies>
+        <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
         <add assembly="System.Web.Mvc, Version=5.2.3, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL"/>
         <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL"/>
         <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL"/>
diff --git a/src/Orchard.Web/Core/Web.config b/src/Orchard.Web/Core/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Core/Web.config
+++ b/src/Orchard.Web/Core/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Lucene/Web.config b/src/Orchard.Web/Modules/Lucene/Web.config
index 995c0c4a0..4a91bbece 100644
--- a/src/Orchard.Web/Modules/Lucene/Web.config
+++ b/src/Orchard.Web/Modules/Lucene/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Markdown/Web.config b/src/Orchard.Web/Modules/Markdown/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Markdown/Web.config
+++ b/src/Orchard.Web/Modules/Markdown/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Alias/Web.config b/src/Orchard.Web/Modules/Orchard.Alias/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Alias/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Alias/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.AntiSpam/Web.config b/src/Orchard.Web/Modules/Orchard.AntiSpam/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.AntiSpam/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.AntiSpam/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.ArchiveLater/Web.config b/src/Orchard.Web/Modules/Orchard.ArchiveLater/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.ArchiveLater/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.ArchiveLater/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.AuditTrail/Web.config b/src/Orchard.Web/Modules/Orchard.AuditTrail/Web.config
index 7903437ef..8e7fae3fe 100644
--- a/src/Orchard.Web/Modules/Orchard.AuditTrail/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.AuditTrail/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Autoroute/Web.config b/src/Orchard.Web/Modules/Orchard.Autoroute/Web.config
index 345f43cdb..b15c7fded 100644
--- a/src/Orchard.Web/Modules/Orchard.Autoroute/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Autoroute/Web.config
@@ -23,6 +23,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Azure.MediaServices/Web.config b/src/Orchard.Web/Modules/Orchard.Azure.MediaServices/Web.config
index 99fcfc34b..562141169 100644
--- a/src/Orchard.Web/Modules/Orchard.Azure.MediaServices/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Azure.MediaServices/Web.config
@@ -24,7 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
-                <!--<add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>-->
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Azure/Web.config b/src/Orchard.Web/Modules/Orchard.Azure/Web.config
index 04f219a35..42c67ce8e 100644
--- a/src/Orchard.Web/Modules/Orchard.Azure/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Azure/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Blogs/Web.config b/src/Orchard.Web/Modules/Orchard.Blogs/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Blogs/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Blogs/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Caching/Web.config b/src/Orchard.Web/Modules/Orchard.Caching/Web.config
index 995c0c4a0..4a91bbece 100644
--- a/src/Orchard.Web/Modules/Orchard.Caching/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Caching/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.CodeGeneration/CodeGenerationTemplates/ModuleRootWebConfig.txt b/src/Orchard.Web/Modules/Orchard.CodeGeneration/CodeGenerationTemplates/ModuleRootWebConfig.txt
index aa5957136..cdcd6d0f6 100644
--- a/src/Orchard.Web/Modules/Orchard.CodeGeneration/CodeGenerationTemplates/ModuleRootWebConfig.txt
+++ b/src/Orchard.Web/Modules/Orchard.CodeGeneration/CodeGenerationTemplates/ModuleRootWebConfig.txt
@@ -29,6 +29,7 @@
   <system.web>
     <compilation targetFramework="4.5.1">
       <assemblies>
+        <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
         <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
         <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
         <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
diff --git a/src/Orchard.Web/Modules/Orchard.CodeGeneration/Web.config b/src/Orchard.Web/Modules/Orchard.CodeGeneration/Web.config
index cc91eeb94..0bd3e0f33 100644
--- a/src/Orchard.Web/Modules/Orchard.CodeGeneration/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.CodeGeneration/Web.config
@@ -24,6 +24,7 @@
   <system.web>
     <compilation targetFramework="4.5.1">
       <assemblies>
+        <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
         <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
         <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
         <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Comments/Web.config b/src/Orchard.Web/Modules/Orchard.Comments/Web.config
index 01862cf75..701d1b469 100644
--- a/src/Orchard.Web/Modules/Orchard.Comments/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Comments/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Conditions/Web.config b/src/Orchard.Web/Modules/Orchard.Conditions/Web.config
index 2974c0850..0d1acd02f 100644
--- a/src/Orchard.Web/Modules/Orchard.Conditions/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Conditions/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.ContentPermissions/Web.config b/src/Orchard.Web/Modules/Orchard.ContentPermissions/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.ContentPermissions/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.ContentPermissions/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.ContentPicker/Web.config b/src/Orchard.Web/Modules/Orchard.ContentPicker/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.ContentPicker/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.ContentPicker/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.ContentTypes/Web.config b/src/Orchard.Web/Modules/Orchard.ContentTypes/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.ContentTypes/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.ContentTypes/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.CustomForms/Web.config b/src/Orchard.Web/Modules/Orchard.CustomForms/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.CustomForms/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.CustomForms/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Dashboards/Web.config b/src/Orchard.Web/Modules/Orchard.Dashboards/Web.config
index 1ad5c5731..93f8488e5 100644
--- a/src/Orchard.Web/Modules/Orchard.Dashboards/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Dashboards/Web.config
@@ -24,6 +24,7 @@
   <system.web>
     <compilation targetFramework="4.5.1">
       <assemblies>
+        <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
         <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
         <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
         <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.DesignerTools/Web.config b/src/Orchard.Web/Modules/Orchard.DesignerTools/Web.config
index 7903437ef..8e7fae3fe 100644
--- a/src/Orchard.Web/Modules/Orchard.DesignerTools/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.DesignerTools/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.DynamicForms/Web.config b/src/Orchard.Web/Modules/Orchard.DynamicForms/Web.config
index 3c8816669..ac8553016 100644
--- a/src/Orchard.Web/Modules/Orchard.DynamicForms/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.DynamicForms/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Email/Web.config b/src/Orchard.Web/Modules/Orchard.Email/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Email/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Email/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Fields/Web.config b/src/Orchard.Web/Modules/Orchard.Fields/Web.config
index b4a83b361..0b2be52fe 100644
--- a/src/Orchard.Web/Modules/Orchard.Fields/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Fields/Web.config
@@ -25,6 +25,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Forms/Web.config b/src/Orchard.Web/Modules/Orchard.Forms/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Forms/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Forms/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.ImageEditor/Web.config b/src/Orchard.Web/Modules/Orchard.ImageEditor/Web.config
index 29c0a0848..39366683f 100644
--- a/src/Orchard.Web/Modules/Orchard.ImageEditor/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.ImageEditor/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.ImportExport/Web.config b/src/Orchard.Web/Modules/Orchard.ImportExport/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.ImportExport/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.ImportExport/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Indexing/Web.config b/src/Orchard.Web/Modules/Orchard.Indexing/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Indexing/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Indexing/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.JobsQueue/Web.config b/src/Orchard.Web/Modules/Orchard.JobsQueue/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.JobsQueue/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.JobsQueue/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Layouts/Web.config b/src/Orchard.Web/Modules/Orchard.Layouts/Web.config
index 57ae191c1..561d01901 100644
--- a/src/Orchard.Web/Modules/Orchard.Layouts/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Layouts/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Lists/Web.config b/src/Orchard.Web/Modules/Orchard.Lists/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Lists/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Lists/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Localization/Web.config b/src/Orchard.Web/Modules/Orchard.Localization/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Localization/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Localization/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Media/Web.config b/src/Orchard.Web/Modules/Orchard.Media/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Media/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Media/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.MediaLibrary/Web.config b/src/Orchard.Web/Modules/Orchard.MediaLibrary/Web.config
index 7903437ef..8e7fae3fe 100644
--- a/src/Orchard.Web/Modules/Orchard.MediaLibrary/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.MediaLibrary/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.MediaPicker/Web.config b/src/Orchard.Web/Modules/Orchard.MediaPicker/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.MediaPicker/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.MediaPicker/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.MediaProcessing/Web.config b/src/Orchard.Web/Modules/Orchard.MediaProcessing/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.MediaProcessing/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.MediaProcessing/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.MessageBus/Web.config b/src/Orchard.Web/Modules/Orchard.MessageBus/Web.config
index 995c0c4a0..4a91bbece 100644
--- a/src/Orchard.Web/Modules/Orchard.MessageBus/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.MessageBus/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Migrations/Web.config b/src/Orchard.Web/Modules/Orchard.Migrations/Web.config
index 995c0c4a0..4a91bbece 100644
--- a/src/Orchard.Web/Modules/Orchard.Migrations/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Migrations/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Modules/Web.config b/src/Orchard.Web/Modules/Orchard.Modules/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Modules/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Modules/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.MultiTenancy/Web.config b/src/Orchard.Web/Modules/Orchard.MultiTenancy/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.MultiTenancy/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.MultiTenancy/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.OutputCache/Web.config b/src/Orchard.Web/Modules/Orchard.OutputCache/Web.config
index 480172886..bc1b1893d 100644
--- a/src/Orchard.Web/Modules/Orchard.OutputCache/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.OutputCache/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Packaging/Web.config b/src/Orchard.Web/Modules/Orchard.Packaging/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Packaging/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Packaging/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Pages/Web.config b/src/Orchard.Web/Modules/Orchard.Pages/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Pages/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Pages/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Projections/Web.config b/src/Orchard.Web/Modules/Orchard.Projections/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Projections/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Projections/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.PublishLater/Web.config b/src/Orchard.Web/Modules/Orchard.PublishLater/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.PublishLater/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.PublishLater/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Recipes/Web.config b/src/Orchard.Web/Modules/Orchard.Recipes/Web.config
index b1fc93bd4..9d4feba09 100644
--- a/src/Orchard.Web/Modules/Orchard.Recipes/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Recipes/Web.config
@@ -24,6 +24,7 @@
   <system.web>
     <compilation targetFramework="4.5.1">
       <assemblies>
+        <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
         <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
         <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
         <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Redis/Web.config b/src/Orchard.Web/Modules/Orchard.Redis/Web.config
index 3dd34a792..4c0b6467c 100644
--- a/src/Orchard.Web/Modules/Orchard.Redis/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Redis/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Resources/Web.config b/src/Orchard.Web/Modules/Orchard.Resources/Web.config
index 6a221096f..d016468c4 100644
--- a/src/Orchard.Web/Modules/Orchard.Resources/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Resources/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Roles/Web.config b/src/Orchard.Web/Modules/Orchard.Roles/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Roles/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Roles/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Rules/Web.config b/src/Orchard.Web/Modules/Orchard.Rules/Web.config
index 7ffca63b9..444714bc2 100644
--- a/src/Orchard.Web/Modules/Orchard.Rules/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Rules/Web.config
@@ -27,6 +27,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Scripting.CSharp/Web.config b/src/Orchard.Web/Modules/Orchard.Scripting.CSharp/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Scripting.CSharp/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Scripting.CSharp/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Scripting.Dlr/Web.config b/src/Orchard.Web/Modules/Orchard.Scripting.Dlr/Web.config
index 995c0c4a0..4a91bbece 100644
--- a/src/Orchard.Web/Modules/Orchard.Scripting.Dlr/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Scripting.Dlr/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Scripting/Web.config b/src/Orchard.Web/Modules/Orchard.Scripting/Web.config
index 995c0c4a0..4a91bbece 100644
--- a/src/Orchard.Web/Modules/Orchard.Scripting/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Scripting/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Search/Web.config b/src/Orchard.Web/Modules/Orchard.Search/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Search/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Search/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.SecureSocketsLayer/Web.config b/src/Orchard.Web/Modules/Orchard.SecureSocketsLayer/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.SecureSocketsLayer/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.SecureSocketsLayer/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Setup/Web.config b/src/Orchard.Web/Modules/Orchard.Setup/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Setup/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Setup/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Tags/Web.config b/src/Orchard.Web/Modules/Orchard.Tags/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Tags/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Tags/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.TaskLease/Web.config b/src/Orchard.Web/Modules/Orchard.TaskLease/Web.config
index b01cbce18..3b8f8fe7c 100644
--- a/src/Orchard.Web/Modules/Orchard.TaskLease/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.TaskLease/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Taxonomies/Web.config b/src/Orchard.Web/Modules/Orchard.Taxonomies/Web.config
index 8c6ad0b86..d937ac99a 100644
--- a/src/Orchard.Web/Modules/Orchard.Taxonomies/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Taxonomies/Web.config
@@ -23,6 +23,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Templates/Web.config b/src/Orchard.Web/Modules/Orchard.Templates/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Templates/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Templates/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Themes/Web.config b/src/Orchard.Web/Modules/Orchard.Themes/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Themes/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Themes/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Tokens/Web.config b/src/Orchard.Web/Modules/Orchard.Tokens/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Tokens/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Tokens/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Users/Web.config b/src/Orchard.Web/Modules/Orchard.Users/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Users/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Users/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Warmup/Web.config b/src/Orchard.Web/Modules/Orchard.Warmup/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Warmup/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Warmup/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Widgets/Web.config b/src/Orchard.Web/Modules/Orchard.Widgets/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Widgets/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Widgets/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.Workflows/Web.config b/src/Orchard.Web/Modules/Orchard.Workflows/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.Workflows/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.Workflows/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Orchard.jQuery/Web.config b/src/Orchard.Web/Modules/Orchard.jQuery/Web.config
index 68b402f2b..a25b15a09 100644
--- a/src/Orchard.Web/Modules/Orchard.jQuery/Web.config
+++ b/src/Orchard.Web/Modules/Orchard.jQuery/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/SysCache/Web.config b/src/Orchard.Web/Modules/SysCache/Web.config
index b01cbce18..3b8f8fe7c 100644
--- a/src/Orchard.Web/Modules/SysCache/Web.config
+++ b/src/Orchard.Web/Modules/SysCache/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/TinyMce/Web.config b/src/Orchard.Web/Modules/TinyMce/Web.config
index 53d7b1351..cc65bf778 100644
--- a/src/Orchard.Web/Modules/TinyMce/Web.config
+++ b/src/Orchard.Web/Modules/TinyMce/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Modules/Upgrade/Web.config b/src/Orchard.Web/Modules/Upgrade/Web.config
index 997fe5966..3da252d03 100644
--- a/src/Orchard.Web/Modules/Upgrade/Web.config
+++ b/src/Orchard.Web/Modules/Upgrade/Web.config
@@ -24,6 +24,7 @@
     <system.web>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Themes/Web.config b/src/Orchard.Web/Themes/Web.config
index b418593ea..cae0d15ad 100644
--- a/src/Orchard.Web/Themes/Web.config
+++ b/src/Orchard.Web/Themes/Web.config
@@ -39,6 +39,7 @@
         </pages>
         <compilation targetFramework="4.5.1">
             <assemblies>
+                <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                 <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
                 <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
diff --git a/src/Orchard.Web/Web.config b/src/Orchard.Web/Web.config
index c53796d59..766c3314b 100644
--- a/src/Orchard.Web/Web.config
+++ b/src/Orchard.Web/Web.config
@@ -51,6 +51,7 @@
         <add extension=".csproj" type="Orchard.Environment.Extensions.Compilers.CSharpExtensionBuildProviderShim" />
       </buildProviders>
       <assemblies>
+        <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
         <add assembly="System.Web.Mvc, Version=5.2.3, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL" />
         <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL" />
         <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL" />