Problem upgrading from 5.9.4 to 5.9.11

["Jean-Yves Avenard" <jyavenard@xxxxxxxxx>]

Hi

Currently experiencing some issues with offlineimap, all messages from
my imap server are duplicated about 10 times on the other imap server
(microsoft exchange).

So I tried upgrading to the latest version of offlineimap

After installing, I get this error:
    from offlineimap import imaplibutil, imaputil, threadutil
  File "/usr/local/lib/python2.5/site-packages/offlineimap/imaplibutil.py",
line 106, in <module>
    class WrappedIMAP4_SSL(IMAP4_SSL):
NameError: name 'IMAP4_SSL' is not defined

What else should I be doing to install offlineimap ?

Thanks
Jean-Yves