System.Web.HttpUnhandledException: Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.Web.HttpException: Multiple controls with the same ID '__Page' were found. Trace requires that controls have unique IDs.
   at System.Web.TraceContext.AddNewControl(String id, String parentId, String type, Int32 viewStateSize, Int32 controlStateSize)
   at System.Web.UI.Control.BuildProfileTree(String parentId, Boolean calcViewState)
   at System.Web.UI.Page.BuildPageProfileTree(Boolean enableViewState)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   --- End of inner exception stack trace ---
   at System.Web.UI.Page.HandleError(Exception e)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest()
   at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context)
   at System.Web.UI.Page.ProcessRequest(HttpContext context)
   at System.Web.Mobile.ErrorHandlerModule.Application_Error(Object source, EventArgs e)