EF4 Unable to load one or more of the requested types on test server

I developed an ASP.NET v4 application using Entity Framework 4. I'm deploying it to the test server (Windows 2008 R2 with .NET Framework 4 installed).

The application throws this error:

[ReflectionTypeLoadException: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.]

System.Reflection.RuntimeModule.GetTypes(RuntimeModule module) +0

System.Reflection.Assembly.GetTypes() +144 System.Data.Metadata.Edm.ObjectItemConventionAssemblyLoader.LoadTypesFromAssembly() +45 System.Data.Metadata.Edm.ObjectItemAssemblyLoader.Load() +34 System.Data.Metadata.Edm.AssemblyCache.LoadAssembly(Assembly assembly, Boolean loadReferencedAssemblies, ObjectItemLoadingSessionData loadingData) +130

System.Data.Metadata.Edm.AssemblyCache.LoadAssembly(Assembly assembly, Boolean loadReferencedAssemblies, KnownAssembliesSet knownAssemblies, EdmItemCollection edmItemCollection, Action1 logLoadMessage, Object& loaderCookie, Dictionary2& typesInLoading, List1& errors) +248

System.Data.Metadata.Edm.ObjectItemCollection.LoadAssemblyFromCache(ObjectItemCollection objectItemCollection, Assembly assembly, Boolean loadReferencedAssemblies, EdmItemCollection edmItemCollection, Action1 logLoadMessage) +580

System.Data.Metadata.Edm.ObjectItemCollection.ImplicitLoadAssemblyForType(Type type, EdmItemCollection edmItemCollection) +121

System.Data.Metadata.Edm.MetadataWorkspace.ImplicitLoadAssemblyForType(Type type, Assembly callingAssembly) +178

System.Data.Objects.ObjectContext.GetTypeUsage(Type entityCLRType) +49

System.Data.Objects.ObjectContext.CreateObjectSet(String entitySetName) +163

PageManager.FetchDefaultPage() +114

When I look on my development PC 开发者_如何学CI see this directory with assemblies:

C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0

But on the server the whole .NETFramework directory is missing, there is just a v3.0 and v3.5 directory. I assume the server is using the assembly from one of these directories which are version 3.5.0.0 and not 4.0.0.0 (what my app is referencing).

What do I need to install? .NET 4 is installed on the server i'm 100% sure.

The problem was nothing to do with .NET 4. I caught the ReflectionTypeLoadException and looped the LoaderExceptions. References to Microsoft.SyncronisationFramework were missing.

Perhaps a direct message in the exception with a list of missing references would be nice.

I believe your question is answered here: http://msdn.microsoft.com/en-us/library/cc656912.aspx