Login failure
 

I Recieved the message when i booted the system of rhel 9 version 2.4.20.8 "The theme for the graphical greeter is corrupt. It does not contain definition for the username/password entry element."What is the resun for getting such message and how did it happen?please help me

You are using a VERY old and unsupported version of RH http://www.server-world.info called RH9 (Shrike).
The new version is called RHEL (note the E = Enterprise) and is only up to v6.3.
NB: you would have to pay to use this, so I recommend Centos instead: a free rebuild of RHEL.
The old RH series will not support current HW.