can anyone help me. I’m a beginner trying to start magic mirror but I keep receiving this error message. says something about electron not found

pi@raspberrypi:~/MagicMirror $ npm start

magicmirror@2.6.0 start /home/pi/MagicMirror
sh run-start.sh

run-start.sh: 4: run-start.sh: electron: not found
npm ERR! file sh
npm ERR! code ELIFECYCLE
npm ERR! errno ENOENT
npm ERR! syscall spawn
npm ERR! magicmirror@2.6.0 start: sh run-start.sh
npm ERR! spawn ENOENT
npm ERR!
npm ERR! Failed at the magicmirror@2.6.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR! /home/pi/.npm/_logs/2019-01-08T10_13_58_006Z-debug.log
pi@raspberrypi:~/MagicMirror $