Error message after logging into CPCWiki

[Prodatron]

When I log into my CPC-Wiki account I get a broken screen with this error message on top of it:

Strict Standards: Declaration of SkinGuMaxV::initPage() should be compatible with that of Skin::initPage() in /<path>/skins/GuMaxV.php on line 0

Instead of the menu on the left side there are only messages like...
"Original exception: exception 'MWException' with message 'Call to undefined method SkinGuMaxV::tooltipAndAccesskey' in /path/Skin.php:1550 Stack trace: #0 /<path>/GuMaxV.php(152): Skin->__call('tooltipAndAcces...', Array) #1 /<path>/skins"
...and the main page stays empty.
Can someone please solve this?

CU,
Prodatron

[Gryzor]

Ah, you have probably set the old skin as your skin manually, but it's broken with the new mediawiki version. 

Hold on...

Ah damn, I have to edit the server's config file to repair that, and can't do that from the office... please hold on till tonight

[Prodatron]

Ok, thank you very much!! 

[Gryzor]

Hey mate, can you tell me if it works for you now?

[Prodatron]

Hey great, thanx a lot for fixing it, Gryzor! 

[Gryzor]

Nah, thanks to you. I learn something new every day; in this case: when a theme breaks, you have to deal with all the users who already have it set in their preferences. Didn't occur to me, I thought the new default would be a blanket setting, which turned out to be wrong.

[TFM]

Puh! Sounds like a lot of work. I better leave my fingers off the themes ;-) It looks well anyway :-)

[Gryzor]

Yeah, I should probably disable the rest...