@teandryk I too had this problem earlier today. I solved it by navigating to /node_modules/electron
and run “sudo node install.js”. Have some patience - it took a loooong time. I ended up leaving it and went to do something else. When I got back half an hour later it was done and the mirror was running.

Hope it helps. Good luck :-)

@sdetweil I am so sorry. I don’t know how I missed this from one installation to another but feel truly ashamed. What happened is that I used a copy of config.js that I thought was the one working from previous install. But it was missing the classes clause to show the modules.

Again, so sorry and super grateful for putting me on the right track :)