PermissionError while running function

[Laplace12]

Okay. I am working with Windows and checked the rights on that folder: my account is the Owner and should have Full control. The folder is simply one I've created and put all the mca files in, and the path should definitely be correct. In another function which relies on a certain file number, the path is ''\\\\...\\home\\s\\myacc\\Documents\\XAS\\mca_CeNO3\\mca_{:05}' and the reading works just fine, with this function I'm trying to read the whole directory, so it's simply ''\\\\...\\home\\s\\myacc\\Documents\\XAS\\mca_CeNO3' and there's an error, nothing else changed.