[Spambayes] Spambayes quits after a while

[Ken Gordon]

I am new to this program - running SpamBayes IMAP Filter Version 0.2 
(February 2004) and engine SpamBayes Engine Version 0.3 (January 2004 under 
OSX - 10.3.7.

After imapfilter.py has been running for some time - and the amount of time 
varies - I get the following error:


Traceback (most recent call last):
  File "./sb_imapfilter.py", line 857, in ?
    run()
  File "./sb_imapfilter.py", line 843, in run
    imap_filter.Train()
  File "./sb_imapfilter.py", line 677, in Train
    num_ham_trained = folder.Train(self.classifier, False)
  File "./sb_imapfilter.py", line 601, in Train
    for msg in self:
  File "./sb_imapfilter.py", line 528, in __iter__
    yield self[key]
  File "./sb_imapfilter.py", line 560, in __getitem__
    data = _extract_fetch_data(response[1][0])
  File "./sb_imapfilter.py", line 162, in _extract_fetch_data
    mo = FETCH_RESPONSE_RE.match(response)
TypeError: expected string or buffer

Does anyone have any suggestions? Thanks.