'Problem with ExportAsFixedFormat , Excel proccess not closing

We have a code that exports some data to excel, then uses that excel file to generate a pdf file using the exportAsFixedFormat function. Now it is failing with system exception regularly.

the below is the code

oBook.ExportAsFixedFormat(XlFixedFormatType.xlTypePDF,
                      paramExportFilePath, paramExportQuality,
                      paramIncludeDocProps, paramIgnorePrintAreas,
                      paramFromPage, paramToPage, paramOpenAfterPublish)

        ' Close book
        oBook.Close()
        '
        'Exit Excel
        oExcel.Quit()

below is the exception error we are getting

System.Exception: System.Exception: System.Runtime.InteropServices.COMException (0x800A03EC): Exception from HRESULT: 0x800A03EC at Microsoft.Office.Interop.Excel._Workbook.ExportAsFixedFormat(XlFixedFormatType Type, Object Filename, Object Quality, Object IncludeDocProperties, Object IgnorePrintAreas, Object From, Object To, Object OpenAfterPublish, Object FixedFormatExtClassPtr)

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'Problem with ExportAsFixedFormat , Excel proccess not closing

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