Force Stopping a Session does nothing


I come from KDE, but I wanted to explore GNOME, so I did the guide to install GNOME on Arch Linux and did all of that stuff. But When I got to > systemctl start gdm it went to the login screen, but when I entered my password, it told me to Force Quit the Session, but the button did nothing. I tried again, and again, and still I was facing this issue.
Can anyone tell me what’s the problem?

(if it’s relevant: I’m running Arch on a Latitude D630)