Hi,

same here. Rebooted RasPi many times, changed port in config file to 9080 but mirror is not displaying anything.

Output is still the same:

pi@magicmirror:~/MagicMirror $ npm run config:check

> magicmirror@2.12.0 config:check /home/pi/MagicMirror
> node js/check_config.js

[2020-08-07 09:53:37.955] [INFO]   Checking file...  /home/pi/MagicMirror/config/config.js
[2020-08-07 09:53:38.247] [LOG]    Line 1 col 1 Definition for rule 'prettier/prettier' was not found.
/home/pi/MagicMirror/js/check_config.js:66
			throw new Error("Wrong syntax in config file!");
			^

Error: Wrong syntax in config file!
    at /home/pi/MagicMirror/js/check_config.js:66:10
    at FSReqWrap.readFileAfterClose [as oncomplete] (internal/fs/read_file_context.js:53:3)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! magicmirror@2.12.0 config:check: `node js/check_config.js`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the magicmirror@2.12.0 config:check 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/2020-08-07T07_53_38_325Z-debug.log

What else can I try?