[help] artookit android app crashes after a few seconds

Hi everyone! I'm trying to make an AR app for an university project and I'm having some issues with the android part.
I'm using ARtookit instead of vuforia because it's open surce.

The program is pretty easy. It has to use the camera to view a couple of 3d objects that are linked to the markers. On windows I have no issues but as soon as i lunch the app on my phone I can see the camera in a corner of the screen even if on the unity project it is centered and the UI canvas i set to render and scale.
the other problem with the apk is that after the unity loading screen the app crashes.

Also the app should be in landscape mode but i think that problem could be addressed later.

Does anyone have the same problem?