Entity Framework gives me a NullReferenceException

Question

Hey guys,

I have created a conceptual entity in my EF model called Task. Then I imported the INSERT, UPDATE, DELETE stored procedures into my model and mapped them to Task.

In my client code, I have something like this:

myModel.AddToTasks(new Task(...));
myModel.SaveChanges();

However, it gives me a NullReferenceException from EnsuareAllCSpaceContainerSetsAreMapped() method.

Is this because I haven't mapped the Task entity and its properties to a Table in database?

Please note that I cannot map my conceptual entities to my database tables because of how this database is designed. It doesn't have a separate table per entity. We have few generic tables like Entities, Attributes, Relationships, etc that all our entities are stored in.

Any ideas?

This is the stack trace for the exception:

at System.Data.Mapping.ViewGeneration.ViewgenGatekeeper.EnsureAllCSpaceContainerSetsAreMapped(IEnumerable1 cells, ConfigViewGenerator config, StorageEntityContainerMapping containerMapping) at System.Data.Mapping.ViewGeneration.ViewgenGatekeeper.GenerateViewsFromCells(List1 cells, ConfigViewGenerator config, CqlIdentifiers identifiers, StorageEntityContainerMapping containerMapping) at System.Data.Mapping.ViewGeneration.ViewgenGatekeeper.GenerateViewsFromMapping(StorageEntityContainerMapping containerMapping, ConfigViewGenerator config) at System.Data.Mapping.StorageMappingItemCollection.ViewDictionary.SerializedGenerateViews(EntityContainer container, Dictionary2 resultDictionary) at System.Data.Mapping.StorageMappingItemCollection.ViewDictionary.SerializedGetGeneratedViews(EntityContainer container) at System.Data.Common.Utils.Memoizer2.<>c_DisplayClass2.b_0() at System.Data.Common.Utils.Memoizer2.Result.GetValue() at System.Data.Common.Utils.Memoizer2.Evaluate(TArg arg) at System.Data.Mapping.StorageMappingItemCollection.ViewDictionary.GetGeneratedView(EntitySetBase extent, MetadataWorkspace workspace, StorageMappingItemCollection storageMappingItemCollection) at System.Data.Mapping.Update.Internal.ViewLoader.InitializeEntitySet(EntitySetBase entitySetBase, MetadataWorkspace workspace) at System.Data.Mapping.Update.Internal.ViewLoader.SyncInitializeEntitySet[TArg,TResult](EntitySetBase entitySetBase, MetadataWorkspace workspace, Func`2 evaluate, TArg arg) at System.Data.Mapping.Update.Internal.ExtractorMetadata..ctor(EntitySetBase entitySetBase, StructuralType type, UpdateTranslator translator) at System.Data.Mapping.Update.Internal.UpdateTranslator.GetExtractorMetadata(EntitySetBase entitySetBase, StructuralType type)
at System.Data.Mapping.Update.Internal.ExtractorMetadata.ExtractResultFromRecord(IEntityStateEntry stateEntry, Boolean isModified, IExtendedDataRecord record, Boolean useCurrentValues, UpdateTranslator translator, ModifiedPropertiesBehavior modifiedPropertiesBehavior) at System.Data.Mapping.Update.Internal.RecordConverter.ConvertStateEntryToPropagatorResult(IEntityStateEntry stateEntry, Boolean useCurrentValues, ModifiedPropertiesBehavior modifiedPropertiesBehavior) at System.Data.Mapping.Update.Internal.ExtractedStateEntry..ctor(UpdateTranslator translator, IEntityStateEntry stateEntry) at System.Data.Mapping.Update.Internal.UpdateTranslator.LoadStateEntry(IEntityStateEntry stateEntry) at System.Data.Mapping.Update.Internal.UpdateTranslator.PullModifiedEntriesFromStateManager() at System.Data.Mapping.Update.Internal.UpdateTranslator.ProduceCommands() at System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter) at System.Data.EntityClient.EntityAdapter.Update(IEntityStateManager entityCache) at System.Data.Objects.ObjectContext.SaveChanges(SaveOptions options) at System.Data.Objects.ObjectContext.SaveChanges() at ConsoleApplication3.Program.Main(String[] args) in d:\workstation configuration\documents and settings\mh54\my documents\visual studio 2010\Projects\ConsoleApplication3\ConsoleApplication3\Program.cs:line 21 at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart()

Cheers, Mosh