[Mailman-Users] HELP !!!!

[Justin]

When i try and post a msg i get this error

>: Command died with status 2:
    "/home/mailman/mail/wrapper mailcmd communica". Command output: Failure to
    exec script. WANTED gid 12, GOT gid 99.  (Reconfigure to take 99?)

How can i fix this . ?
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