[Exim] mailman error

hi
i'm getting this error with mailman..i had no error while configuration


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This message was created automatically by mail delivery software (Exim).

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  system-request@???
    Child process of list_request_transport transport returned 2 from
command:
    /home/mailman/mail/wrapper

Madan Rai
Net4India Ltd.
URL: http://www.net4india.com
KeyWord: Net4India
(Just type keyword in IE address bar and press enter.)