@Mykle1 I was using pm2 start, npm from the directory seems to work fine. Am trying some forum posts like https://stackoverflow.com/questions/24468041/npm-install-gives-error-cant-find-a-package-json-file but nothing has worked yet.

I have installed MM for the first time (Raspberry Pi 3 Model B) and everything seemed to be working fine, just playing around with stopping and starting with PM2, all was good. But I tried rebooting the pi to check the autoboot and MM does not work at all any more. It goes briefly to the MM loading screen before crashing and going to the normal pi screen. When I try to boot through terminal the MM loading screen does not show and nothing comes up. The error log gives this message:

Error: ENOENT: no such file or directory, open 'package.json'
    at Object.fs.openSync (fs.js:646:18)
    at Object.fs.readFileSync (fs.js:551:33)
    at Object. (/home/pi/MagicMirror/js/app.js:15:32)
    at Module._compile (module.js:643:30)
    at Object.Module._extensions..js (module.js:654:10)
    at Module.load (module.js:556:32)
    at tryModuleLoad (module.js:499:12)
    at Function.Module._load (module.js:491:3)
    at Module.require (module.js:587:17)
    at require (internal/module.js:11:18)

I am pretty new to all this and it is the first time I have used JS.

Thanks,
Ben