I'm getting unknown or unsupported romset , am writing inside <path_to_roms>/<rom_name> like this

<home\user\MyDocs\roms>/<kof96> and without the <> <> My roms are on the folder roms on MyDocs. Still the same, I can start gui with

python /opt/gngeo-gui/gngeo-gui.py

But the same games don' start when clicked on start button, I think I have to copy the files of gngeo from some place to another or move, but don't mess with those things I don't understand much. Please help me Ade, otherwise I'll just go back to previous version...
Thank you anyway for trying to help me.