Request error with WCF Data Services - entity-framework

Question

Its my first time setting up an OData Service and I'm of course having some problems...
The problem is that I can't get the service running, I keep getting an "Request Error".
I have researched on what the problem can be and I found that a common issue is that the access rules are incorrectly typed. So I have tried fixing this both with Singular names, Plural names and I have also tried with typeof(Post).getType().Name
Well here is my code. I hope you can help me, I've been stuck for hours.
public class ODataService : DataService<Entity>
{
// This method is called only once to initialize service-wide policies.
public static void InitializeService( DataServiceConfiguration config )
{
//config.SetEntitySetAccessRule( "Users", EntitySetRights.All );
//config.SetEntitySetAccessRule( "Posts", EntitySetRights.All );
//config.SetEntitySetAccessRule( "Albums", EntitySetRights.All );
config.SetEntitySetAccessRule( "*", EntitySetRights.AllRead );
config.SetServiceOperationAccessRule( "*", ServiceOperationRights.AllRead );
//config.SetServiceOperationAccessRule( "GetPosts", ServiceOperationRights.AllRead );
config.UseVerboseErrors = true;
config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V2;
}
[WebGet]
public IQueryable<Post> GetPosts()
{
return CurrentDataSource.Posts.AsQueryable();
}
}
The structure of my EntityFramework class (db first)
Methods and Members for Entity class. Here the entities are spelled in plural.
This is my Web.config:
<?xml version="1.0"?>
<!--
For more information on how to configure your ASP.NET application, please visit
http://go.microsoft.com/fwlink/?LinkId=169433
-->
<configuration>
<connectionStrings>
<add name="Entity" connectionString="metadata=res://*/;provider=System.Data.SqlClient;provider connection string="data source=XXX;Initial Catalog=XXX;persist security info=True;user id=XXX;password=XXX;MultipleActiveResultSets=True;App=EntityFramework"" providerName="System.Data.EntityClient" />
</connectionStrings>
<appSettings>
<add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" />
<add key="ValidationSettings:UnobtrusiveValidationMode" value="WebForms" />
</appSettings>
<system.web>
<compilation debug="true" targetFramework="4.5" />
<httpRuntime requestValidationMode="4.5" targetFramework="4.5" encoderType="System.Web.Security.AntiXss.AntiXssEncoder, System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
<pages controlRenderingCompatibilityVersion="4.5" />
<machineKey compatibilityMode="Framework45" />
</system.web>
<system.serviceModel>
<services>
<service name="LinkIT.Core.OData.ODataService" behaviorConfiguration ="DebugEnabled">
</service>
</services>
<behaviors>
<serviceBehaviors >
<behavior name="DebugEnabled">
<serviceDebug includeExceptionDetailInFaults="True"/>
</behavior>
</serviceBehaviors>
</behaviors>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true"/>
</system.serviceModel>
</configuration>
A detailed error message:
The server encountered an error processing the request. The exception
message is 'Value cannot be null. Parameter name:
propertyResourceType'. See server logs for more details. The exception
stack trace is:
at System.Data.Services.WebUtil.CheckArgumentNull[T](T value, String
parameterName) at
System.Data.Services.Providers.ResourceProperty..ctor(String name,
ResourcePropertyKind kind, ResourceType propertyResourceType) at
System.Data.Services.Providers.ObjectContextServiceProvider.PopulateMemberMetadata(ResourceType
resourceType, IProviderMetadata workspace, IDictionary2 knownTypes,
PrimitiveResourceTypeMap primitiveResourceTypeMap) at
System.Data.Services.Providers.ObjectContextServiceProvider.PopulateMetadata(IDictionary2
knownTypes, IDictionary2 childTypes, IDictionary2 entitySets) at
System.Data.Services.Providers.BaseServiceProvider.PopulateMetadata()
at System.Data.Services.Providers.BaseServiceProvider.LoadMetadata()
at
System.Data.Services.DataService1.CreateMetadataAndQueryProviders(IDataServiceMetadataProvider&
metadataProviderInstance, IDataServiceQueryProvider&
queryProviderInstance, BaseServiceProvider& builtInProvider, Object&
dataSourceInstance) at
System.Data.Services.DataService1.CreateProvider() at
System.Data.Services.DataService1.HandleRequest() at
System.Data.Services.DataService1.ProcessRequestForMessage(Stream
messageBody) at SyncInvokeProcessRequestForMessage(Object , Object[] ,
Object[] ) at
System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object
instance, Object[] inputs, Object[]& outputs) at
System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc&
rpc) at
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc&
rpc) at
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage41(MessageRpc&
rpc) at
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc&
rpc) at
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc&
rpc) at
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3(MessageRpc&
rpc) at
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2(MessageRpc&
rpc) at
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11(MessageRpc&
rpc) at
System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1(MessageRpc&
rpc) at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean
isOperationContextSet)

Answer 1

WCF Data Services team confirms - this is the exact error faced when you use Enums (which is not yet supported).
Remove the Enum types (or use their suggested work-around and use a wrapper around the enum properties) and this should go away.