For some reason, this error pops up for some clients. A client's data was transferred form 2020 Proseries, and at some point this message pops up and I can't open it no longer. However, if this 2021 Proseries file is run by my colleague. It seems working perfectly fine. 

FYI. The directories I use for saving and opening files are from Microsoft 'OneDrive' and my colleague is the one who share the directories. I wonder if this makes any difference.