Quick update. I hacked around some updates to Node, npm etc, but nothing seemed to work.

So I removed the async and the await from the addCalendars function so it looks something like this (file: MMM-CalendarExt.js)

addCalendars: function() {
   var self = this
   for (var c in this.CurrentConfigs.calendars) {
     self.addCalendar(self.CurrentConfigs.getCalConfig(c))
     sleep(1000)
   }
 },

Seems to work for now. But looking back through github I don’t see that these are recent additions so I don’t know why this started failing now. Hopefully somebody smarter than I will figure it out.

I’m having the same issue for the past few days.

Updated to the latest release of MM today hoping it would solve it somehow but no luck.