:System.Runtime.InteropServices.COMException (0x800A03EC):
Exception from HRESULT: 0x800A03EC at Microsoft.Office.Interop.Excel._Workbook.SaveAs(Object Filename,Object FileFormat, Object Password, Object WriteResPassword, Object ReadOnlyRecommended, Object CreateBackup, XlSaveAsAccessMode AccessMode, Object ConflictResolution, Object AddToMru, Object TextCodepage, Object TextVisualLayout, Object Local)
at Stock.EService.ReadExistingExcel()

mWorkBook.SaveAs(path3, Excel.XlFileFormat.xlWorkbookNormal, Missing.Value, Missing.Value, false, false, Excel.XlSaveAsAccessMode.xlNoChange,Excel.XlSaveConflictResolution.xlUserResolution, true,Missing.Value, Missing.Value, Missing.Value);

mWorkBook.Close(true, Missing.Value,Missing.Value);