NPM start not running but Localhost8080 is

[undergroundauth]

When i run command ‘npm install && node serveronly’
the mirror works on localhost8080

but when i run the command ‘npm start’ i get this error
Please help … is there any step i am missing

pi@raspberrypi:~/MagicMirror $ npm start

magicmirror@2.1.1 start /home/pi/MagicMirror
sh run-start.sh

/home/pi/MagicMirror/node_modules/electron/index.js:9
throw new Error(‘Electron failed to install correctly, please delete node_modules/’ + path.basename(__dirname) + ’ and try installing again’)
^

Error: Electron failed to install correctly, please delete node_modules/electron and try installing again
at Object. (/home/pi/MagicMirror/node_modules/electron/index.js:9:9)
at Module._compile (module.js:570:32)
at Object.Module._extensions…js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.require (module.js:497:17)
at require (internal/module.js:20:19)
at Object. (/home/pi/MagicMirror/node_modules/electron/cli.js:3:16)
at Module._compile (module.js:570:32)