[Mailman-Users] Bug in Mailman version 2.0.11

[Cassandra Fleetwood]

 Mailman 2.0.11, Apache-1.3.23, Python-1.5.2

My Mailman installation has been running fine for a couple of months.
Today Mailman began displaying the following error when attempting to access
the admin page or list info page for any list:

"Bug in Mailman version 2.0.11
We're sorry, we hit a bug!
Please inform the webmaster for this site of this problem. Printing of
traceback and other system information has been explicitly inhibited, but
the webmaster can find this information in the Mailman error logs."

No errors in /mailman/logs/error, no locks in mailman/locks. What else
should I check?
-Cassandra