hello, im very new to all of this and I’ve followed all the guides I have found and I’ve even looked at similar instances on my issue in the forum but i can’t for the life of me figure out what is going wrong.

This is the forum I tried to follow along with and i still couldn’t get it going.
https://forum.magicmirror.builders/topic/18012/problem-installing-new-module-beginner-calendarext3-not-displaying?lang=en-US&page=1
on the other hand this forum showed me how to see in a general area where the problem might be coming from.

Here is the current Config that I’m running.

/* MagicMirror² Config
	language: "en",
	locale: "en-US",
	logLevel: ["INFO", "LOG", "WARN", "ERROR"], // Add "DEBUG" for even more logging
	timeFormat: 24,
	units: "metric",

	modules: [
		{
			module: "calendar",
			position: "top_left",
			header: "Upcoming Events",
			coloredText: true,
			config: {
				broadcastPastEvents: true, // <= IMPORTANT to see past events
				calendars: [
					{
						url: "https://ics.calendarlabs.com/76/mm3137/US_Holidays.ics",
						name: "Holiday1",
						color: "#2a4d56",
						symbol: false
					},
					{
						url: "https://calendar.google.com/calendar/xxxx",
						name: "Person1",
						color: "#0872fc",
						symbol: false
					}
				]
			}
		},
		{
			module: "MMM-CalendarExt3",
			position: "bottom_bar",
			title: "my calendars",
			config: {
				mode: "month",
				locale: 'en-US',
				maxEventLines: 5,
				firstDayOfWeek: 0,
				weekIndex: 0,
				weeksInView: 4,
				waitFetch: 10 * 1000,
				refreshInterval: 10 * 60 * 1000,
				glanceTime: 0 * 60 * 1000,
				eventTimeOptions: {
					timeStyle: "short"
				},
				//useSymbol: false,
				calendarSet: [ 'Holiday1' ],
			}
		},
	]
};

after following along in the mentioned forum about locating the issue using dev (developer tools)
I was able to see this - (im currently using “node serveronly” cause for some reason i cant get it to run on its own but anyway thats another topic for another time, so this is what i see in the consol of the web browser).

Initializing MagicMirror².
translator.js:122 Loading core translation file: translations/en.json
translator.js:138 Loading core translation fallback file: translations/en.json
loader.js:165 Load script: modules/default/calendar/calendar.js
module.js:476 Check MagicMirror² version for module 'calendar' - Minimum version:  2.1.0 - Current version: 2.26.0
module.js:478 Version is ok!
module.js:484 Module registered: calendar
loader.js:138 Bootstrapping module: calendar
loader.js:165 Load script: modules/default/calendar/calendarutils.js
loader.js:165 Load script: vendor/node_modules/moment/min/moment-with-locales.js
loader.js:142 Scripts loaded for: calendar
loader.js:180 Load stylesheet: modules/default/calendar/calendar.css
loader.js:180 Load stylesheet: vendor/css/font-awesome.css
loader.js:145 Styles loaded for: calendar
loader.js:148 Translations loaded for: calendar
loader.js:165 Load script: modules/MMM-CalendarExt3/MMM-CalendarExt3.js
MMM-CalendarExt3.js:4 This browser doesn't support popover yet. Update your system.
module.js:484 Module registered: MMM-CalendarExt3
loader.js:138 Bootstrapping module: MMM-CalendarExt3
loader.js:142 Scripts loaded for: MMM-CalendarExt3
loader.js:180 Load stylesheet: modules/MMM-CalendarExt3/MMM-CalendarExt3.css
loader.js:145 Styles loaded for: MMM-CalendarExt3
loader.js:148 Translations loaded for: MMM-CalendarExt3
loader.js:180 Load stylesheet: css/custom.css
localhost/:1 Refused to apply style from 'http://localhost:8080/css/custom.css' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.
loader.js:190 Error on loading stylesheet: css/custom.css
calendar.js:97 Starting module: calendar
main.js:608 All modules started!
MMM-CalendarExt3.js:372 [CX3] Module is not prepared yet, wait a while.
getDom	@	MMM-CalendarExt3.js:372
(anonymous)	@	main.js:138
updateDom	@	main.js:118
(anonymous)	@	main.js:61
createDomObjects	@	main.js:20
modulesStarted	@	main.js:611
startModules	@	loader.js:43
await in startModules (async)		
loadNextModule	@	loader.js:222
await in loadNextModule (async)		
loadNextModule	@	loader.js:215
await in loadNextModule (async)		
loadNextModule	@	loader.js:215
await in loadNextModule (async)		
loadModules	@	loader.js:225
init	@	main.js:595
await in init (async)		
(anonymous)	@	main.js:738
TypeError: original.map(...).toSorted is not a function
    at formatEvents (CX3_shared.mjs:341:6)
    at prepareEvents (CX3_shared.mjs:376:10)
    at Class.draw (MMM-CalendarExt3.js:658:26)
    at Class.getDom (MMM-CalendarExt3.js:375:16)
    at main.js:138:35
    at new Promise (<anonymous>)
    at updateDom (main.js:118:10)
    at Object.updateDom (main.js:676:4)
    at Class.updateDom (module.js:336:6)
    at Class.updateAnimate (MMM-CalendarExt3.js:681:10)
Promise.catch (async)		
(anonymous)	@	main.js:151
updateDom	@	main.js:118
updateDom	@	main.js:676
updateDom	@	module.js:336
updateAnimate	@	MMM-CalendarExt3.js:681
(anonymous)	@	MMM-CalendarExt3.js:166
setTimeout (async)		
(anonymous)	@	MMM-CalendarExt3.js:165
Promise.then (async)		
start	@	MMM-CalendarExt3.js:162
startModules	@	loader.js:26
loadNextModule	@	loader.js:222
await in loadNextModule (async)		
loadNextModule	@	loader.js:215
await in loadNextModule (async)		
loadNextModule	@	loader.js:215
await in loadNextModule (async)		
loadModules	@	loader.js:225
init	@	main.js:595
await in init (async)		
(anonymous)	@	main.js:738

let me know if this is too much info or not enough or anything really.