Runtipi WebGUI not loading - 404 error

Hi!

I have some problems getting into Runtipi. If I go to the IP address, I get a “404 page not found” error. It was working once and I installed, for example, ChangeDetection. That still seems to run because I get email notifications about changes on monitored webpages.

I am a beginner in all this, so I did some screenshots to help me explain. Something seems to be wrong, for example I cannot run the command ./runtipi-cli debug.

Oh, as a new user I can only upload one image. I uploaded all 4 images here:
Screenshots on imgur.com

Anything I can do?

Thanks in advance!