[COMException (0x80040209): The requested file is not a valid Mathcad XML worksheet.]
Mathcad.WorksheetsClass.Open(String pFileName) +0
Mathsoft.AppServer.WorksheetPool.CheckoutInstance(String strPath, Int32& processID) +385
Mathsoft.AppServer.WorksheetHandler.GetWorksheet(HttpContext context, String strPath, Boolean& isNewInstance, Int32& procID, Boolean forceReopen) +913
Mathsoft.AppServer.WorksheetHandler.ProcessRequest(HttpContext context) +3573
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +181
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75
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