Thread:Taldin/@comment-27659888-20191228013155/@comment-25085701-20191228040357

Got it working!

1- Create MediaWiki:ImportJS page. It didn't exist previously.

2- Create MediaWIki:Custom-Wiki Manager. It also didn't exist.

3- Add Jr.Mime's name ot the Manager page.

4- Reload the Special:Community page.

Success!