gdm user does not exist

[anupama 2004 <mallik linux gmail com>]

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sir/madam
I am a linux student.
yesterday i removed and reinstalled the setup packages using rpm -ivh
command after using rpm -e setup
after rebooting the system the graphics is not starting and system says
gdm user does not exist. configure your  /etc/X11/gdm/gdm.conf..
pls tell me how to fix the problem.
Thanks/Regards
Mallikarjun Mudumali
9880023898