"Your score could not be saved. An unknown error occurred while saving this file."

Hi all. I keep getting this error: "Your score could not be saved. An unknown error occurred while saving this file." This happens to every file I've tried. Files I've saved previously unedited. Blank scores. I've tried saving it to different folders. I've tried uninstalling Musescore 4 and Musehub.

This is the first time that this has happened to me, and it started today when I tried to save a score from the pdf importer. I assumed that this was because the importer screwed up and the file was corrupted, but why is it happening to all of my scores now, even when I reinstalled the program?

Please help, thanks in advance!