Studio 2021 "Access to path C:\Users\xxx\Documents\Sudio 2021\Projects\xxx)\en-US\ATF_Template.docx" denied

Hello, I just upgraded from Studio 2015 to Studio 2021, and when I first tried to open a package, I got an error message saying "Access to path C:\Users\(username)\Documents\Sudio 2021\Projects\(projectname)\en-US\ATF_Template.docx" denied. I found tips for similar issues, saying that adding _old to some of the SDL folders would solve the problem, but it didn't work for me. Any idea of what I could do? Thanks in advance.

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