I’ve had the same problem since upgrading to MagicMirror 2.2.0.

It seems that Node.js is upset that MMM-CalendarExt uses an async function at MMM-CalendarExt.js:182. From what I can tell, Node.js didn’t support async until 7.4, and I’m (apparently) running 6.12.2 (via node -v). However, until I upgraded MagicMirror this weekend, MMM-CalendarExt was working fine.

I just edited run-start.sh:4 to the following, and just got MMM-CalendarExt working again:

electron --js-flags="--harmony-async-await" js/electron.js $1

Can someone explain why upgrading to MagicMirror 2.2.0 would’ve rolled back the Node.js support for async?