UnicodeEncodeError: 'ascii' codec can't encode character

On drag and drop but also on scanning the library there this message comes.

file = "/home/robert/Musik/Grossstadtgeflüster/Muss Laut Sein/01. Grossstadtgeflüster - Grossstadtgeflüster.ogg"

I was also not able to create random100/500 playlists if these files was in the library
after a restart exaile removed the files out of the library (they were imported at 0.11) and then it works fine but without these files

console output:
Count is now: 199
Clearing tracks cache
-----------------------
 read_from_path ( /usr/local/lib/exaile/xl/media/__init__.py @ 524):
-----------------------
Traceback (most recent call last):
  File "/usr/local/lib/exaile/xl/media/__init__.py", line 544, in read_from_path
    format.fill_tag_from_path(tr)
  File "/usr/local/lib/exaile/xl/media/ogg.py", line 42, in fill_tag_from_path
    f = mutagen.oggvorbis.OggVorbis(tr.io_loc)
  File "/usr/local/lib/exaile/xl/media/__init__.py", line 388, in get_loc_for_io
    return self._loc.encode(xlmisc.get_default_encoding())
UnicodeEncodeError: 'ascii' codec can't encode character u'\xfc' in position 33: ordinal not in range(128)