Using nodm display manager

[zweipunktnull]

Hey ;)

I am having a general question using the nodm displaymanager and maybe you can help me. I want to start a GUI Application while startup CENTOS operating system without using KDE. For this I want to use the nodm display manager. I read that i only have to edit the nodm.conf file. I enabled it and set the user as root in this file. But when I want to start the GUI it is still showing from the terminal, that it cannot start the X-application. Maybe you can help me.. Thank you so much for reading and helping

Cheers