Crash when converting docx to pdf

[thaiminhlien]

Unfortunately, I get this error when using your tool in server side asp.net mvc.
I opened 2 browser tab and try to convert docx to pdf in the same time.
Does it support to run on this platform?

System.Runtime.InteropServices.InvalidComObjectException: COM object that has been separated from its underlying RCW cannot be used.
at System.StubHelpers.StubHelpers.GetCOMIPFromRCW(Object objSrc, IntPtr pCPCMD, IntPtr& ppTarget, Boolean& pfNeedsRelease)
at Microsoft.Office.Interop.Word.ApplicationClass.Quit(Object& SaveChanges, Object& OriginalFormat, Object& RouteDocument)
at OfficeToPDF.WordConverter.CloseWordApplication(Application word) in D:\OfficeToPDF-master\OfficeToPDF-master\OfficeToPDF\WordConverter.cs:line 575
at OfficeToPDF.WordConverter.Convert(String inputFile, String outputFile, Hashtable options) in