i m setting error as  server error in application.............

The remote procedure call failed. (Exception from HRESULT: 0x800706BE)




            ExcelApp.UserControl = false;
            String FileName = "" + User.Identity.Name + ".xlsx";
            ExcelWork.SaveCopyAs(strCurrentDir + FileName);
            String TimeSheetPath = (String)System.Configuration.ConfigurationManager.AppSettings["TimeSheetPath"].ToString();
            string strMachineName = Request.ServerVariables["SERVER_NAME"];