Error Msg sending newsletter

["Cencigh, Maurizio {PGID~Kaiseraugst}" <MAURIZIO . CENCIGH @ Roche . COM>]

hi all,

I'm migrating a Server, so I installed a new Majordomo on the new
server. I copied the old lists and aliases.
When I send a mail to majordomo like who listname or lists, I get back
an answer. When I try to send a newsletter
to a list I get the error message below. Anybody an idea? Please help.
My majordomo isn't working right now.

  Unable to expand a distribution list to deliver the message to its
members.  Try again or contact your system administrator.

Thanks in advance.
Maurizio