'NoneType' object has no attribute 'group' at the start of a sync

[Sriram ET.]

I have just installed v6.5.2.1 on MacOS X Lion using Homebrew. I have
customized the simple configuration for a single imap account on my
company's Lotus Notes based server. When I attempt to start the first sync,
I first get queries for my password and then I get the following error. I
could not find any answers quickly using Google. Can anyone throw some
light on this issue? Am I doing something stupid?

 *** Finished account 'Cleartrip' in 0:04
[thread]: Unregister thread 'Account sync Cleartrip'
ERROR: Exceptions occurred during the run!
ERROR: While attempting to sync account 'Cleartrip'
  'NoneType' object has no attribute 'group'

Traceback:
  File "/usr/local/Cellar/offline-imap/
6.5.2.1/libexec/offlineimap/accounts.py", line 231, in syncrunner
    self.sync()
  File "/usr/local/Cellar/offline-imap/
6.5.2.1/libexec/offlineimap/accounts.py", line 287, in sync
    remoterepos.getfolders()
  File "/usr/local/Cellar/offline-imap/
6.5.2.1/libexec/offlineimap/repository/IMAP.py", line 266, in getfolders
    imapobj = self.imapserver.acquireconnection()
  File "/usr/local/Cellar/offline-imap/
6.5.2.1/libexec/offlineimap/imapserver.py", line 298, in acquireconnection
    imaputil.imapsplit(listres[0])[1:]
  File "/usr/local/Cellar/offline-imap/
6.5.2.1/libexec/offlineimap/imaputil.py", line 152, in imapsplit
    retval.append(m.group('quote'))
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