For some reason Calibre won’t let me do anything because “drive is full” which I assume has to do with this.
Update: I believe I “fixed” the error with Calibre by using FlatSeal to add environment variable CALIBRE_TEMP_DIR that changes the Temp directory to something else. So far that’s the only program I’ve seen give trouble.
Well, I replied to two comments. I was just trying to let them learn the actual cause of OP’s problem so they can help others in the future. I am sorry if I didn’t follow proper etiquette.