[Mailman-Users] Error sending mail to list

[Spades]

I got this error after all , any idea?

>   ----- Transcript of session follows -----
>Failure to exec script. WANTED gid 6, GOT gid 1.  (Reconfigure to take 1?)
>554 5.3.0 "|/home/mailman/mail/wrapper post sg-outing"... unknown mailer
error 2