Thread:Project:Support desk/Editor disappeared after upgrading wiki to latest version/reply (5)

I believe these are two different problems. I do not necessarily see a connection between the class name "ResourceLoaderLanguageNamesModule", which obviously is missing, and the missing Editor.

Does the class name error still happen? If so, you can find the source of the class name error by searching the files of your wiki installation for the text "ResourceLoaderLanguageNamesModule". This should tell you where this (wrong?) class is used.

Please make sure that you followed our manual Upgrade; especially please make sure that no old files of the old MediaWiki version have been left behind as explained in Manual:Upgrading!