SharePoint 2010 - Internal server error exception: System.ServiceModel.FaultException Microsoft.Office.Server.Search.Query.KeywordQueryInternal.Execute()

What?

You might receive an internal server error exception when you use Search Core / Custom Search Results Web Part in SharePoint 2010 with the below exception in ULS log:

Internal server error exception: System.ServiceModel.FaultException Microsoft.Office.Server.Search.Query.KeywordQueryInternal.Execute()


Full Error from ULS:

Internal server error exception: System.ServiceModel.FaultException`1[System.ServiceModel.ExceptionDetail]: Exception from HRESULT: 0x80040E60 (Fault Detail is equal to An ExceptionDetail, likely created by IncludeExceptionDetailInFaults=true, whose value is: System.Runtime.InteropServices.COMException: Exception from HRESULT: 0x80040E60    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)     at       at Microsoft.Office.Server.Search.Query.QueryInternal.Execute(QueryProperties properties)     at Microsoft.Office.Server.Search.Administration.SearchServiceApplication.Execute(QueryProperties properties)     at SyncInvokeExecute(Object , Object[] , Object[] )     at System... 71324a1d-9785-4da4-ba0d-3c2f507e9581
....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.ProcessMessage4(MessageRpc& rpc)    ...). System.ServiceModel.FaultException`1[System.ServiceModel.ExceptionDetail]: Exception from HRESULT: 0x80040E60 (Fault Detail is equal to An ExceptionDetail, likely created by IncludeExceptionDetailInFaults=true, whose value is: System.Runtime.InteropServices.COMException: Exception from HRESULT: 0x80040E60    at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr ... 71324a1d-9785-4da4-ba0d-3c2f507e9581
...errorInfo)     at Microsoft.Office.Server.Search.Query.KeywordQueryInternal.Execute()     at Microsoft.Office.Server.Search.Query.QueryInternal.Execute(QueryProperties properties)     at Microsoft.Office.Server.Search.Administration.SearchServiceApplication.Execute(QueryProperties properties)     at SyncInvokeExecute(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.ProcessMessage4(MessageRpc& rpc)    ...). 71324a1d-9785-4da4-ba0d-3c2f507e9581

Why?

I know of one scenario in which this could occur. If you configure your search web part to sort results based on a managed property and if that property does not have "Reduce storage requirements for text properties by using a hash for comparison" set to true, you will likely encounter this error.

How?

Set the property "Reduce storage requirements for text properties by using a hash for comparison" for the managed property that you intend to use for sort operation to "true"