update database media is failed

hello,
I am facing an issue, I can not update my media database. The script airtime-import just copy the mp3 files on /srv/airtime/orgonize but nothing else happens

Here are last line of the file : /var/log/airtime/media-monitor/media-monitor.log
########################
2012-07-13 16:48:14,480 ERROR - [MainThread] [media_monitor.py : <module>()] : LINE 144 - traceback: Traceback (most recent call last):
  File "/usr/lib/airtime/media-monitor/media_monitor.py", line 128, in <module>
    wdd = notifier.watch_directory(storage_directory)
  File "/usr/lib/airtime/media-monitor/airtimefilemonitor/airtimenotifier.py", line 194, in watch_directory
    return self.wm.add_watch(directory, self.mask, rec=True, auto_add=True)
  File "/usr/lib/airtime/airtime_virtualenv/lib/python2.6/site-packages/pyinotify.py", line 1887, in add_watch
    for rpath in self.__walk_rec(apath, rec):
  File "/usr/lib/airtime/airtime_virtualenv/lib/python2.6/site-packages/pyinotify.py", line 2075, in __walk_rec
    for root, dirs, files in os.walk(top):
  File "/usr/lib/airtime/airtime_virtualenv/lib/python2.6/os.py", line 294, in walk
    for x in walk(path, topdown, onerror, followlinks):
  File "/usr/lib/airtime/airtime_virtualenv/lib/python2.6/os.py", line 284, in walk
    if isdir(join(top, name)):
  File "/usr/lib/airtime/airtime_virtualenv/lib/python2.6/posixpath.py", line 70, in join
    path += '/' + b
  File "/usr/lib/airtime/airtime_virtualenv/lib/python2.6/encodings/utf_8.py", line 16, in decode
    return codecs.utf_8_decode(input, errors, True)
UnicodeDecodeError: 'utf8' codec can't decode byte 0xeb in position 6: invalid continuation byte
############################

Thanks in advance for your help.
DS