Thread:Project:Support desk/Problems with skin after upgrading./reply (6)

The post by 94.197... is misleading and will not solve the problem.

The solution for these messages is to remove those skin files, which are located directly in the skins/ folder: Simple.php, Nostalgia.php, MySkin.php, Standard.php and Chick.php. The same procedure also is described at Manual:Skin_autodiscovery by linking to Manual:Upgrading.

If you are using an own skin, then you will sooner (now) or later (when you upgrade to MediaWiki 1.25) have to update that skin as well. As long as you have not upgraded it, you will get a PHP warning concerning this skin as well (and that not only in MediaWiki 1.25, but also in 1.23 already).