Chromebox with LibreELEC cant get RetroArch to work

Hi.

I am trying to get emulation to work on my chromebox with standalone LibreELEC 7.xx.

I have tried to install RetroArch with no success, get an error while install from zipfile.

I have installed Rom Collection Browser, and i got that working for one game of five, something about an error to write to the art folder.

I have searched for hours on google without any luck.

What am i doing wrong?