Getting an error code in Logic: (OSStatus error -50.)

When I try to save my project I get this error: The operation couldn’t be completed. (OSStatus error -50.) Result code = -50. What does this mean?

I get the error message several times, each time it pertains to a different file in my project folder. However, once it cycles through all problematic files, the session saves. So it seems that only certain files are triggering the issue, however I can't seem to find out why. I can't find any issue with the files causing the error code.

(FYI I'm running Logic Pro version 10.7.3 on macOS Big Sur version 11.6)