- undefined method User::getSkin()
https://www.mediawiki.org/wiki/Release_notes/1.27 > User::getSkin() was removed (deprecated since 1.18)
In SpecialFavoritelist.php just change $this->user-getSkin()
to $this->user
- undefined method User::editToken()
InFavoritelistEditor.php just change $user->editToken()
to $user->getEditToken()