PermissionError while running function

[Gribouillis]

File or directory, the problem is not with the functions that you are using. Where does that (mca file here) come from? That's what you have to find in the code. Normally there should be no problem debugging this: find the exact file or directory that the code is trying to access, check if it exists, if it has the appropriate permissions and that's all. Raise exceptions if necessary or print logs.