broken qmail reinstall - !!!! URGENT !!!!

[Thratchen]

I'm trying to reinstall my existing qmail server after some permissions problmes. But when i reinstalled the package:

psa-qmail-1.03-fc3.build75060321.20.i586.rpm

I got the following error

 Checking for the system groups and users necessary for Qmail...
 Checking for the group 'nofiles'...

ERROR: It seems there is a group with GID=2020
       in this system, but  needs the same GID
       for its operation.
       Sorry, but this situation is not properly handled yet.
       Please, contact

I forced the reinstall but now i only get an error #4.3.0.

Can anyone suggest anything?