It is not possible to create the folder "new folder". the file or directory is not usable

I have an ssd with FydeOS installed and a 1TB HDD for my files. But when I go to paste or create a new folder, the following sentence appears: IT IS NOT POSSIBLE TO CREATE THE FOLDER “NEW FOLDER”. THE FILE OR DIRECTORY IS NOT USABLE.
DOES ANYONE KNOW HOW TO SOLVE IT?