[Mailman-Developers] PairList error (fwd)

[sigma@pair.com]

In the last week or so, we've been seeing the following error and traceback
on several pages, including our main listinfo page at
http://www.pairlist.net/mailman/listinfo/

I've searched and found nothing about this error.  Can someone point me in
the right direction, hopefully?

Thanks,
Kevin Martin
sigma@pair.com

----- Forwarded message -----

Bug in Mailman version 1.2 (experimental)

We're sorry, we hit a bug!

If you would like to help us identify the problem, please email a copy of this page to the webmaster for this site with a
description of what happened. Thanks! 

Traceback:


Traceback (innermost last):
  File "/usr/mailman/scripts/driver", line 112, in run_main
    main()
  File "/usr/mailman/Mailman/Cgi/admin.py", line 67, in main
    mlist = MailList.MailList(listname)
  File "/usr/mailman/Mailman/MailList.py", line 69, in __init__
    self.Load()
  File "/usr/mailman/Mailman/MailList.py", line 839, in Load
    raise Errors.MMBadListError, ('Failed to unmarshal config info: '
TypeError: __add__ nor __radd__ defined for these operands





Environment variables:

 Variable
                      Value
 DOCUMENT_ROOT 
                      /usr/www 
 SERVER_ADDR 
                      216.92.1.92 
 HTTP_ACCEPT_ENCODING 
                      gzip 
 SERVER_PORT 
                      80 
 PATH_TRANSLATED 
                      /usr/www/isc-agent-newsletter 
 GATEWAY_INTERFACE 
                      CGI/1.1 
 HTTP_ACCEPT_LANGUAGE 
                      en,zh-CN 
 SERVER_NAME 
                      www.pairlist.net 
 HTTP_CONNECTION 
                      Keep-Alive 
 HTTP_USER_AGENT 
                      Mozilla/4.7 [en] (WinNT; U) 
 HTTP_ACCEPT_CHARSET 
                      iso-8859-1,*,utf-8 
 HTTP_ACCEPT 
                      image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, image/png, */* 
 REQUEST_URI 
                      /mailman/admin/isc-agent-newsletter 
 PATH 
                      /sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin 
 QUERY_STRING 
 SCRIPT_FILENAME 
                      /usr/mailman/cgi-bin/admin 
 PATH_INFO 
                      /isc-agent-newsletter 
 HTTP_HOST 
                      www.pairlist.net 
 REQUEST_METHOD 
                      GET 
 SERVER_SIGNATURE 
 SCRIPT_NAME 
                      /mailman/admin 
 SERVER_ADMIN 
                      webmaster@pairlist.net 
 SERVER_SOFTWARE 
                      Apache/1.3.9 (Unix) 
 PYTHONPATH 
                      /usr/mailman 
 SERVER_PROTOCOL 
                      HTTP/1.0 
 REMOTE_PORT 
                      1047