UiPath can no longer open sequences

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1

Hi all,

I was working on a project and saved and closed UiPath Studio. When I re-opened it and ran it one more time it went through flawlessly but then the sequence became blank. All of the other smaller sequences that are pulled into the main workflow will not open and I get the following error:

Error: System.Exception: Method ‘ProcessByte’ in type ‘NPOI.POIFS.Crypt.Standard.NullBufferedCipher’ from assembly ‘NPOI.Core, Version=2.7.3.0, Culture=neutral, PublicKeyToken=0df73ec7942b34e1’ does not have an implementation.

Would anyone know why this might be?

3

Raise a case with UiPath Support

Provide:

  • Studio version
  • The zip file with the project/or part of the project that can replicate the issue at will
  • The full error message
  • The exact steps to replicate the issue
  • When it worked last time?
  • What have you done recently to receive this error?
  • Do you have a workaround?
4

I came across same issue and found root cause for the issue.

When I use UiPath.Excel.activities v3.1.1 in the project, it has one of the dependencies as NPOI 2.7.3.

UiPath.Excel.activities previous version v3.0.1 was using NPOI 2.5.6 and opens the workflows without any issues for me.

Solution: If you downgrade UiPath.Excel.activities package to version 3.0.1, it will work.

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5

Hi @Mathavaprakash, could you let us know the list of dependencies you have in your project and the Studio version you are using? Thinking there might be a conflict between dependencies.

Also, it would help if you could DM me the logs - you can get an export using the Diagnostic Tool.

6

This actually worked for me somehow, thank you.

1 Like