Use local image files for cover art

I always end up with the same error when scanning even with log level 0 and opened a ticket for that (Scanning with mopidy-local fails)

I updated the log level to 1 and rescanned.

When I pull the log file with sudo journalctl -u mopidy | tee mopidy.log I end up with a 300 mb file with all logs since I setup mopidy. It appears that the logfile isn’t auto rotated. Where can I find the log file so I can remove it and start new? I didn’t see it in /var/log.