[Mailman-Users] TypeError: illegal argument type for built-in operation

[Bob Puff@NLE]

I had a user tell me his mailing list seemed a little funky, so I started doing some investigations tonight.  Lo and behold, I have a 75 megabyte mailman error log!  It is filled with this:

Aug 15 00:53:01 2001 (4335) Delivery exception: illegal argument type for built-in operation
Aug 15 00:53:01 2001 (4335) Traceback (innermost last):
  File "/home/mailman/Mailman/Handlers/HandlerAPI.py", line 82, in do_pipeline
    func(mlist, msg, msgdata)
  File "/home/mailman/Mailman/Handlers/Replybot.py", line 78, in process
    text = mlist.autoresponse_postings_text % d
TypeError: illegal argument type for built-in operation           

I checked the qfiles directory, and found about a dozen messages there, with their .db files updated with the latest time/date.  I believe most (if not all) these messages were posted prior to my Mailman 2.0rc1 to 2.0.6 update last week.

Is this error because I didn't nuke the qfiles directory before upgrading, or is there a problem here with 2.0.6?  I'm running Python 2.1, and Postfix.

Bob