i have somehow made my redhat 9 app dont start anymore unless i am in root account

recently i have messup with /etc/sudoers file and now all the programs which needs root password to launch wont launch unless i su to root under console and then lauch the program by typing redhat-config-XXXX to launch it.

i cant launch user and groups, sound card detector, printing, and etc.

i have already erased the entry that i have added in /etc/sudoers file but i still cant launch those apps anymore.

it usually will popup a windows asking for passwords but now it dont.