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I am working on an ASP.Net MVC 3 web application using EF 4.1. Since today, I am getting this error: System.ArgumentException: Duplicate type name within an assembly and I can't figure out what is causing it. It is happening in my repository when performing a Find: public virtual T GetById(long id) { return dbset.Find(id); } Here is the stack trace: [ArgumentException: Duplicate type name within an assembly.] System.Reflection.Emit.ModuleBuilder.CheckTypeNameConflict(String strTypeName, TypeBuilder enclosingType) +9544354 System.Reflection.Emit.AssemblyBuilderData.CheckTypeNameConflict(String strTypeName, TypeBuilder enclosingType) +53 System.Reflection.Emit.TypeBuilder.Init(String fullname, TypeAttributes attr, Type parent, Type[] interfaces, Module module, PackingSize iPackingSize, Int32 iTypeSize, TypeBuilder enclosingType) +178 System.Reflection.Emit.ModuleBuilder.DefineType(String name, TypeAttributes attr, Type parent, Type[] interfaces) +118 System.Data.Objects.Internal.ProxyTypeBuilder.get_TypeBuilder() +299 System.Data.Objects.Internal.ProxyTypeBuilder.CreateType(ModuleBuilder moduleBuilder) +227 System.Data.Objects.Internal.EntityProxyFactory.BuildType(ModuleBuilder moduleBuilder, ClrEntityType ospaceEntityType) +63 System.Data.Objects.Internal.EntityProxyFactory.TryCreateProxyType(EntityType ospaceEntityType) +193 System.Data.Objects.Internal.EntityProxyFactory.GetProxyType(ClrEntityType ospaceEntityType) +104 System.Data.Common.Internal.Materialization.Translator.Visit(EntityColumnMap columnMap, TranslatorArg arg) +178 System.Data.Query.InternalTrees.EntityColumnMap.Accept(ColumnMapVisitorWithResults`2 visitor, TArgType arg) +16 System.Data.Common.Internal.Materialization.Translator.ProcessCollectionColumnMap(CollectionColumnMap columnMap, TranslatorArg arg, ColumnMap discriminatorColumnMap, Object discriminatorValue) +116 System.Data.Common.In

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