Error when connecting to slashmail.org

[David Heath <david@xxxxxxxxxxxxxx>]

Hi, 

I am trying to use offline imap to connect to slashmail.org, and am
experiencing the following error. Anything I am doing wrong?

Thanks in advance,

Dave

ERROR MESSAGE
=============

[heathd@localhost heathd]$ offlineimap -u TTY.TTYUI
OfflineIMAP 4.0.6 (Rev 590)
Copyright (C) 2002 - 2004 John Goerzen <jgoerzen@xxxxxxxxxxxx>
This software comes with ABSOLUTELY NO WARRANTY; see the file
COPYING for details.  This is free software, and you are welcome
to distribute it under the conditions laid out in COPYING.
Account sync Slashmail:
   ***** Processing account Slashmail
Account sync Slashmail:
   Copying folder structure from IMAP to Maildir
Account sync Slashmail:
   Establishing connection to slashmail.org:993.
Folder sync Slashmail[.mailboxlist]:
   Syncing .mailboxlist: IMAP -> Maildir
Folder sync Slashmail[INBOX]:
   Syncing INBOX: IMAP -> Maildir
Thread 'Folder sync Slashmail[.mailboxlist]' terminated with exception:
Traceback (most recent call last):
  File "/usr/lib/python2.3/site-packages/offlineimap/threadutil.py",
line 153, in run
    Thread.run(self)
  File "/usr/lib/python2.3/threading.py", line 416, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/lib/python2.3/site-packages/offlineimap/accounts.py", line
201, in syncfolder
    remotefolder.saveuidvalidity()
  File "/usr/lib/python2.3/site-packages/offlineimap/folder/Base.py",
line 106, in saveuidvalidity
    newval = self.getuidvalidity()
  File "/usr/lib/python2.3/site-packages/offlineimap/folder/IMAP.py",
line 62, in getuidvalidity
    imapobj.select(self.getfullname(), readonly = 1)
  File "/usr/lib/python2.3/site-packages/offlineimap/imapserver.py",
line 40, in select
    raise ValueError, "Error from select: %s" % str(result)
ValueError: Error from select: ('NO', ["SELECT failed: Can't
open .mailboxlist
(file /data/slashmail/home/9/4/2/0/aaa100249/.mailboxlist): not in valid
mailbox format"])