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POweb api internal error 500
 

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    <p>I am using the laatest version of web api. I am returning a <code>IQuerable</code> value and i am getting this error:</p> <pre><code>iisexpress.exe Error: 0 : Operation=QueryableAttribute.ActionExecuted, Status=200 (OK), Exception=System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary. at System.Collections.Generic.Dictionary`2.get_Item(TKey key) at System.Web.Http.OData.Builder.EdmTypeBuilder.CreateStructuralTypeBody(EdmStructuredType type, IStructuralTypeConfiguration config) at System.Web.Http.OData.Builder.EdmTypeBuilder.CreateEntityTypeBody(EdmEntityType type, IEntityTypeConfiguration config) at System.Web.Http.OData.Builder.EdmTypeBuilder.CreateEdmTypeBody(IStructuralTypeConfiguration config) at System.Web.Http.OData.Builder.EdmTypeBuilder.&lt;GetEdmTypes&gt;d__0.MoveNext() at System.Linq.Enumerable.&lt;OfTypeIterator&gt;d__aa`1.MoveNext() at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer) at System.Linq.Enumerable.ToDictionary[TSource,TKey](IEnumerable`1 source, Func`2 keySelector) at System.Web.Http.OData.Builder.EdmModelHelperMethods.BuildEdmModel(String containerNamespace, String containerName, IEnumerable`1 entityTypeConfigurations, IEnumerable`1 entitySetConfigurations) at System.Web.Http.OData.Builder.ODataModelBuilder.GetEdmModel() at System.Web.Http.OData.Builder.ODataConventionModelBuilder.GetEdmModel() at System.Web.Http.HttpActionDescriptorExtensions.&lt;&gt;c__DisplayClass1.&lt;GetEdmModel&gt;b__0(Object _) at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory) at System.Web.Http.HttpActionDescriptorExtensions.GetEdmModel(HttpActionDescriptor actionDescriptor, Type entityClrType) at System.Web.Http.QueryableAttribute.OnActionExecuted(HttpActionExecutedContext actionExecutedContext) at System.Web.Http.Tracing.Tracers.ActionFilterAttributeTracer.&lt;&gt;c__DisplayClass4.&lt;OnActionExecuted&gt;b__1() at System.Web.Http.Tracing.ITraceWriterExtensions.TraceBeginEnd(ITraceWriter traceWriter, HttpRequestMessage request, String category, TraceLevel level, String operatorName, String operationName, Action`1 beginTrace, Action execute, Action`1 endTrace, Action`1 errorTrace) iisexpress.exe Error: 0 : Operation=InteractionDataController.ExecuteAsync, Exception=System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary. at System.Collections.Generic.Dictionary`2.get_Item(TKey key) at System.Web.Http.OData.Builder.EdmTypeBuilder.CreateStructuralTypeBody(EdmStructuredType type, IStructuralTypeConfiguration config) at System.Web.Http.OData.Builder.EdmTypeBuilder.CreateEntityTypeBody(EdmEntityType type, IEntityTypeConfiguration config) at System.Web.Http.OData.Builder.EdmTypeBuilder.CreateEdmTypeBody(IStructuralTypeConfiguration config) at System.Web.Http.OData.Builder.EdmTypeBuilder.&lt;GetEdmTypes&gt;d__0.MoveNext() at System.Linq.Enumerable.&lt;OfTypeIterator&gt;d__aa`1.MoveNext() at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer) at System.Linq.Enumerable.ToDictionary[TSource,TKey](IEnumerable`1 source, Func`2 keySelector) at System.Web.Http.OData.Builder.EdmModelHelperMethods.BuildEdmModel(String containerNamespace, String containerName, IEnumerable`1 entityTypeConfigurations, IEnumerable`1 entitySetConfigurations) at System.Web.Http.OData.Builder.ODataModelBuilder.GetEdmModel() at System.Web.Http.OData.Builder.ODataConventionModelBuilder.GetEdmModel() at System.Web.Http.HttpActionDescriptorExtensions.&lt;&gt;c__DisplayClass1.&lt;GetEdmModel&gt;b__0(Object _) at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory) at System.Web.Http.HttpActionDescriptorExtensions.GetEdmModel(HttpActionDescriptor actionDescriptor, Type entityClrType) at System.Web.Http.QueryableAttribute.OnActionExecuted(HttpActionExecutedContext actionExecutedContext) at System.Web.Http.Tracing.Tracers.ActionFilterAttributeTracer.&lt;&gt;c__DisplayClass4.&lt;OnActionExecuted&gt;b__1() at System.Web.Http.Tracing.ITraceWriterExtensions.TraceBeginEnd(ITraceWriter traceWriter, HttpRequestMessage request, String category, TraceLevel level, String operatorName, String operationName, Action`1 beginTrace, Action execute, Action`1 endTrace, Action`1 errorTrace) at System.Web.Http.Tracing.Tracers.ActionFilterAttributeTracer.OnActionExecuted(HttpActionExecutedContext actionExecutedContext) at System.Web.Http.Filters.ActionFilterAttribute.CallOnActionExecuted(HttpActionContext actionContext, HttpResponseMessage response, Exception exception) at System.Web.Http.Filters.ActionFilterAttribute.&lt;&gt;c__DisplayClass2.&lt;System.Web.Http.Filters.IActionFilter.ExecuteActionFilterAsync&gt;b__0(HttpResponseMessage response) at System.Threading.Tasks.TaskHelpersExtensions.&lt;&gt;c__DisplayClass41`2.&lt;Then&gt;b__40(Task`1 t) at System.Threading.Tasks.TaskHelpersExtensions.ThenImpl[TTask,TOuterResult](TTask task, Func`2 continuation, CancellationToken cancellationToken, Boolean runSynchronously) </code></pre> <p>Can someone explain me what the problem is ?</p>
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