Bug di mailman 2.13

Sebelumnya saya menjalankan mailman 2.1.3 di Mandrake 9.0 dan 9.1 dapat
bekerja dengan baik.
Setelah saya pake Mandrake 9.2, ketika mau buat milist lewat browser
tampil bug. Tetapi kalo buat milistnya dari konsol bisa bekerja dengan
baik. Bug yang tampil tersebut sbg berikut....

Bug in Mailman version 2.1.3
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 (most recent call last):
  File "/var/lib/mailman/scripts/driver", line 87, in run_main
    main()
  File "/var/lib/mailman/Mailman/Cgi/create.py", line 55, in main
    process_request(doc, cgidata)
  File "/var/lib/mailman/Mailman/Cgi/create.py", line 219, in
process_request
    sys.modules[modname].create(mlist, cgi=1)
  File "/var/lib/mailman/Mailman/MTA/Postfix.py", line 232, in create
    _update_maps()
  File "/var/lib/mailman/Mailman/MTA/Postfix.py", line 53, in
_update_maps
    raise RuntimeError, msg % (acmd, status, errstr)
RuntimeError: command failed: /usr/sbin/postalias
/var/lib/mailman/data/aliases (status: 1, Operation not permitted)

Kira2 apanya yang salah ya....
Mungkin temen2 di developer ada yang ngerti tolong kasih solusinya....

Regards,


Joko wardono