It is unclear that you need to run the updater script on newer Mediawiki installations for this extension to work, could this be added to the page please?
Topic on Extension talk:CheckUser
Kind of a late reply but I have just had issues of this as well.
I use this after the domain.
/mw-config/
Yeah, that's what I ended up doing too. However, it really should be stated clearly somewhere.
I no longer use mediawiki for anything so this isn't of concern to me any more.
Unless I'm mistaken, all the information is provided in the relevant Extension:CheckUser#Installation section.
Right you are. I guess either I missed that, or you added it since last year, but either way, this is resolved now I guess.
Cheers :)