Local scan fails

Sorry, I’m posting from my phone, maybe that’s the problem.
Mopidy runs as root because this is how DietPi works, basically.

Here are the permissions of the folder:

root@OPiHome:~# l /mnt/dietpi_userdata/mopidy/data/
total 12
drwxrwxr-x 3 root root 4096 Mar 15 20:03 deezer
drwxrwxr-x 2 root root 4096 Aug  7 19:06 local
drwxrwxr-x 2 root root 4096 Mar 15 18:33 local-images

Here is a reposting of the error, let’s see if it works:

ERROR    [Errno 13] Permission denied: '/mnt/dietpi_userdata/mopidy/data/local/library.json.gz.fSFK1W'
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/mopidy/__main__.py", line 134, in main
    return args.command.run(args, proxied_config)
  File "/usr/lib/python2.7/dist-packages/mopidy/local/commands.py", line 167, in run
    library.close()
  File "/usr/lib/python2.7/dist-packages/mopidy/local/json.py", line 17, in close
    'tracks': self._tracks.values()
  File "/usr/lib/python2.7/dist-packages/mopidy/internal/storage.py", line 51, in dump
    prefix=basename + '.', dir=directory, delete=False)
  File "/usr/lib/python2.7/tempfile.py", line 462, in NamedTemporaryFile    (fd, name) = _mkstemp_inner(dir, prefix, suffix, flags)
  File "/usr/lib/python2.7/tempfile.py", line 239, in _mkstemp_inner
    fd = _os.open(file, flags, 0600)
OSError: [Errno 13] Permission denied: '/mnt/dietpi_userdata/mopidy/data/local/library.json.gz.fSFK1W'
Traceback (most recent call last):
  File "/usr/bin/mopidy", line 9, in <module>
    load_entry_point('Mopidy==2.1.0', 'console_scripts', 'mopidy')()
  File "/usr/lib/python2.7/dist-packages/mopidy/__main__.py", line 134, in main
    return args.command.run(args, proxied_config)
  File "/usr/lib/python2.7/dist-packages/mopidy/local/commands.py", line 167, in run
    library.close()
  File "/usr/lib/python2.7/dist-packages/mopidy/local/json.py", line 17, in close
    'tracks': self._tracks.values()
  File "/usr/lib/python2.7/dist-packages/mopidy/internal/storage.py", line 51, in dump
    prefix=basename + '.', dir=directory, delete=False)
  File "/usr/lib/python2.7/tempfile.py", line 462, in NamedTemporaryFile    (fd, name) = _mkstemp_inner(dir, prefix, suffix, flags)
  File "/usr/lib/python2.7/tempfile.py", line 239, in _mkstemp_inner
    fd = _os.open(file, flags, 0600)
OSError: [Errno 13] Permission denied: '/mnt/dietpi_userdata/mopidy/data/local/library.json.gz.fSFK1W'

Thanks