erreur portage

# time emerge portage -uva

Performing Global Updates:
(Could take a couple of minutes if you have a lot of binary packages.)
  .='update pass'  *='binary update'  #='/var/db update'  @='/var/db move'
  s='/var/db SLOT move'  %='binary move'  S='binary SLOT move'
  p='update /etc/portage/package.*'
/usr/portage/profiles/updates/3Q-2011................
Traceback (most recent call last):
  File "/usr/bin/emerge", line 43, in <module>
    retval = emerge_main()
  File "/usr/lib/portage/pym/_emerge/main.py", line 1531, in emerge_main
    _global_updates(trees, mtimedb["updates"], quiet=("--quiet" in myopts)):
  File "/usr/lib/portage/pym/portage/_global_updates.py", line 204, in _global_updates
    shlex_split(mysettings.get("CONFIG_PROTECT", "")),
  File "/usr/lib/portage/pym/portage/util/__init__.py", line 512, in shlex_split
    rval = shlex.split(s)
  File "/usr/lib/python2.6/shlex.py", line 279, in split
    return list(lex)
  File "/usr/lib/python2.6/shlex.py", line 269, in next
    token = self.get_token()
  File "/usr/lib/python2.6/shlex.py", line 96, in get_token
    raw = self.read_token()
  File "/usr/lib/python2.6/shlex.py", line 191, in read_token
    raise ValueError, "No escaped character"
ValueError: No escaped character