NPOI exeption when opening stream

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I'm using below code to read and write to the xlsx sheet using NPOI
- Below code works but it's trowing handled [System.MissingMethodException] exceptions

Using opening a file stream for reading / writing has been the only way I can write the sheet information back to the xlsx file ???
I don't think the method is missing for opening a stream ...again its working

how can I make this work - without getting the exceptions?

Dim Worksheet_FileStream As FileStream = New FileStream(WorkSheet_path, FileMode.Open, FileAccess.Read)
               XLSX_WORKBOOK = New NPOI.XSSF.UserModel.XSSFWorkbook(Worksheet_FileStream)
               Worksheet_FileStream.Close()

What I have tried:

different methods to open the file

Posted 2-Dec-23 9:11am

Georg Kohler

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Dave Kreskowiak 2-Dec-23 19:27pm

The best source of information and support on a 3rd party library is the people who wrote the library. Their discussion forums are at nissl-lab/npoi · Discussions · GitHub[^].

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Maciej Los · Answer 1 · 2023-12-03T05:55:00

Please, read this: https://stackoverflow.com/questions/8058832/system-missingmethodexception-method-not-found[^].
It could be a problem with:
- duplicated name of method,
- obslolete NuGet package,
- etc.

I'd suggest to read this also: MissingMethodException Class (System) | Microsoft Learn[^]