Linux, Php 5.3. The wiki is otherwise working fine. As usual I simply copied the files to the skins folder and tried to activate the skin in 'My preferences'.
Does it have anything to do with this: http://www.mediawiki.org/wiki/Manual:Ho ... ateToolbox? It was introduced in MW no earlier than version 1.18 (from the release notes: "Pure "Skin" class based custom skins are no longer supported, all custom skins should be put together using SkinTemplate and BaseTemplate or QuickTemplate").
I have, extensions include Semantic MediaWiki (and related stuff like Semantic Forms), HeaderTabs, CategoryTree, CustomSidebar, FancyBoxThumbs, and Mulitple Uploads. Any extension which is known to cause problems?
Sorry, I had to wait for a quiet moment when disabling extensions would cause the least amount of annoyance with visitors. But no, it had no effect whatsoever.
I know this is an old post but it is still not resolved. I`m on the latest 1.17.5 and I`m still getting this error. I`m looking forward to getting a followup.