mail man problem

[chartoon1]

Hello,
I have a plesk 7.5 reloaded with default mailman installed on it.
I am getting the following error messages for the mails send to mailing list
Failure_to_exec_mailman_wrapper._WANTED_gid_110,_GOT_gid_101.__(Reconfigure_to_take_101?)/did_0+0+1/

The pop user have following entry in etc/passwd file
popuser:x:110:101OP3 service user

Is there any solution?