Read the statement by Michael Teeuw here.
MM not loading after software update
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 Not sure if the recent software update has anything to do with MM not loading. This is/are the error(s); 
 19.08.2022 22:52.46.248] [ERROR] WARNING! Could not validate config file. Starting with default configuration. Please correct syntax errors at or above this line: /home/pi/MagicMirror/node_modules/jsdom/lib/jsdom/browser/parser/html.js:170
 after._pushedOnStackOfOpenElements?.();
 ^SyntaxError: Unexpected token . 
 at Module._compile (internal/modules/cjs/loader.js:722:23)
 at Object.Module._extensions…js (internal/modules/cjs/loader.js:798:10)
 at Module.load (internal/modules/cjs/loader.js:645:32)
 at Function.Module._load (internal/modules/cjs/loader.js:560:12)
 at Module.require (internal/modules/cjs/loader.js:685:19)
 at require (internal/modules/cjs/helpers.js:16:16)
 at Object. (/home/pi/MagicMirror/node_modules/jsdom/lib/jsdom/browser/parser/index.js:4:20)
 at Module._compile (internal/modules/cjs/loader.js:786:30)
 at Object.Module._extensions…js (internal/modules/cjs/loader.js:798:10)
 at Module.load (internal/modules/cjs/loader.js:645:32)
 [19.08.2022 22:52.46.249] [LOG] Loading module helpers …
 [19.08.2022 22:52.46.250] [LOG] No helper found for module: alert.
 [19.08.2022 22:52.46.250] [LOG] Initializing new module helper …
 [19.08.2022 22:52.46.251] [LOG] Module helper loaded: MMM-AlexaControl
 [19.08.2022 22:52.46.251] [LOG] Initializing new module helper …
 [19.08.2022 22:52.46.252] [LOG] Module helper loaded: updatenotification
 [19.08.2022 22:52.46.253] [LOG] No helper found for module: clock.
 [19.08.2022 22:52.46.253] [LOG] Initializing new module helper …
 [19.08.2022 22:52.46.254] [LOG] Module helper loaded: calendar
 [19.08.2022 22:52.46.254] [LOG] No helper found for module: calendar_monthly.
 [19.08.2022 22:52.46.255] [LOG] No helper found for module: weather.
 [19.08.2022 22:52.46.270] [ERROR] App threw an error during load
 [19.08.2022 22:52.46.270] [ERROR] /home/pi/MagicMirror/node_modules/jsdom/lib/jsdom/browser/parser/html.js:170
 after._pushedOnStackOfOpenElements?.();
 ^Any help would be greatly appreciated. 
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 @Redicaljk k… not sure on calendar… on onthisday do cd ~/MagicMirror/modules/MMM-OnThisDay rm -rf node_modules rm package-lock.json npm install --omit=devthen try again , works here 
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 @Redicaljk how did you update? 
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 @sdetweil I clicked on Install Updates from the notification in the Task Bar. 
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 @Redicaljk MagicMirror does not update that way, only system stuff. but maybe node/npm changed 
 .can u show results ofnode -v 
 npm -v
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 @sdetweil sorry, I am a complete newbie. I tried entering node-v and npm-v in the terminal and I get “command not found”. 
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 @Redicaljk there is a space between node and -v 
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 @sdetweil thank you! 
 pi@rpi4:~ $ node -v
 v16.17.0
 pi@rpi4:~ $ npm -v
 8.15.0
 pi@rpi4:~ $
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 @Redicaljk ok, lets redo the npm install for MagicMirror cd ~/MagicMirror rm -rf node_modules rm package-lock.json npm install --omit=dev
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 @sdetweil done. Still having an issue: magicmirror@2.20.0 start 
 DISPLAY=“${DISPLAY:=:0}” ./node_modules/.bin/electron js/electron.js[20.08.2022 09:12.14.860] [LOG] Starting MagicMirror: v2.20.0 
 [20.08.2022 09:12.14.865] [LOG] Loading config …
 [20.08.2022 09:12.14.871] [LOG] Loading module helpers …
 [20.08.2022 09:12.14.873] [LOG] No helper found for module: alert.
 [20.08.2022 09:12.15.181] [LOG] Initializing new module helper …
 [20.08.2022 09:12.15.182] [LOG] Module helper loaded: MMM-AlexaControl
 [20.08.2022 09:12.15.185] [LOG] Initializing new module helper …
 [20.08.2022 09:12.15.186] [LOG] Module helper loaded: updatenotification
 [20.08.2022 09:12.15.186] [LOG] No helper found for module: clock.
 [20.08.2022 09:12.15.403] [LOG] Initializing new module helper …
 [20.08.2022 09:12.15.404] [LOG] Module helper loaded: calendar
 [20.08.2022 09:12.15.404] [LOG] No helper found for module: calendar_monthly.
 [20.08.2022 09:12.15.405] [LOG] No helper found for module: weather.
 [20.08.2022 09:12.15.408] [ERROR] WARNING! Could not load config file. Starting with default configuration. Error found: Error: Cannot find module ‘jsdom’
 Require stack:- /home/pi/MagicMirror/modules/MMM-OnThisDay/node_helper.js
- /home/pi/MagicMirror/js/app.js
- /home/pi/MagicMirror/js/electron.js
- /home/pi/MagicMirror/node_modules/electron/dist/resources/default_app.asar/main.js
 
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 @Redicaljk see this topic, for missing libraries https://forum.magicmirror.builders/topic/15778/fix-for-black-screen-in-2-16-and-later, 1st post gives instructions 
