getcopyinstancelimit NotImplementedException

[Randy Orrison <randy@xxxxxxxxxxx>]

I'm getting the following error while syncing my mailboxes.  The local
maildir contains messages, and I've created the corresponding folder on my
IMAP server (which is currently empty):


Thread 'Folder sync Mailboxes[.MailingLists.orrison-l]' terminated with
exception:
Traceback (most recent call last):
  File "/usr/lib/python2.2/site-packages/offlineimap/threadutil.py", line
  151, in run
    Thread.run(self)
  File "/usr/lib/python2.2/threading.py", line 396, in run
    apply(self.__target, self.__args, self.__kwargs)
  File "/usr/lib/python2.2/site-packages/offlineimap/accounts.py", line 211,
  in syncfolder
    localfolder.syncmessagesto(statusfolder)
  File "/usr/lib/python2.2/site-packages/offlineimap/folder/Base.py", line
  339, in syncmessagesto
    self.syncmessagesto_neguid(dest, applyto)
  File "/usr/lib/python2.2/site-packages/offlineimap/folder/Base.py", line
  204, in syncmessagesto_neguid
    thread = InstanceLimitedThread(\
  File "/usr/lib/python2.2/site-packages/offlineimap/folder/Base.py", line
  42, in getcopyinstancelimit
    raise NotImplementedException
NameError: global name 'NotImplementedException' is not defined

I've had look at the code, but it's not obvious to me how it should be
implemented...

(This is version 3.99.9 as installed from debian unstable.)

Thanks!

Randy