Thread:Project:Support desk/Install the Gumax skin (4.0.3)/reply

I think it has something to do with this line: "It has been tested and works with MediaWiki 1.17.0" ;) MediaWiki 1.17 is really oudated and not supported anymore.

The Hook mentioned in the expect (in MW 1.23) two variables (array &$vars, OutputPage $out), the first as a reference. The skin file try to run the Hook as th efollowing:

(only one parameter and not as a reference. So that's why the skin fails :) Try to upgrade to a newer versions or contact the developers, if they can help you to upgrade this skin version to work with newer versions of MediaWiki.