VB.NET生成Excel，已存在提示框点否时报错

如题

Exception from HRESULT: 0x800A03EC

最终没有好的解决方案，只好屏蔽掉

            Try

                obook.SaveAs(excelSaveName)

            Catch ex As System.Runtime.InteropServices.COMException

                '屏蔽掉Exception from HRESULT: 0x800A03EC

            End Try