ERROR while syncing IMAP account

[Walter Hartford]

Hi there,

I get this error while syncing my Mail account:

OfflineIMAP 6.5.5
  Licensed under the GNU GPL v2+ (v2 or any later version)
Account sync main:
 *** Processing account main
 Establishing connection to imap.web.de:993
 Creating folder Postausgang[Local]
 Creating folder BARFOO[Local]
 Creating folder Entwurf[Local]
 Creating folder INBOX[Local]
 Creating folder Trash[Local]
 Creating folder Gesendet[Local]
 Creating folder FOOOOBAR[Local]
 Creating folder /[Remote]
 ERROR: While attempting to sync account 'main'
  CREATE command error: BAD ['unsupported folder name']. Data: GLAK8 CREATE /

 *** Finished account 'main' in 0:00
ERROR: Exceptions occurred during the run!
ERROR: While attempting to sync account 'main'
  CREATE command error: BAD ['unsupported folder name']. Data: GLAK8 CREATE /


Traceback:
  File "/usr/local/lib/python2.7/site-packages/offlineimap/accounts.py", line 241, in syncrunner
    self.sync()
  File "/usr/local/lib/python2.7/site-packages/offlineimap/accounts.py", line 306, in sync
    remoterepos.sync_folder_structure(localrepos, statusrepos)
  File "/usr/local/lib/python2.7/site-packages/offlineimap/repository/Base.py", line 236, in sync_folder_structure
    src_repo.makefolder(dst_name_t)
  File "/usr/local/lib/python2.7/site-packages/offlineimap/repository/IMAP.py", line 392, in makefolder
    result = imapobj.create(foldername)
  File "/usr/local/lib/python2.7/site-packages/offlineimap/imaplib2.py", line 703, in create
    return self._simple_command('CREATE', mailbox, **kw)
  File "/usr/local/lib/python2.7/site-packages/offlineimap/imaplib2.py", line 1615, in _simple_command
    return self._command_complete(self._command(name, *args), kw)
  File "/usr/local/lib/python2.7/site-packages/offlineimap/imaplib2.py", line 1381, in _command_complete
    raise self.error('%s command error: %s %s. Data: %.100s' % (rqb.name, typ, dat, rqb.data))

Can someone explain that error, or what is going wrong here? I didn't find something useful with Google.

Regards,
Walter
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