Thread:Project:Support desk/Upgrade = Invalid callback SpecialMyLanguage

Hi everyone. Yesterday I tried to upgrade to 1.25 by navigating to /mw-config/ I have done that, for I received a message from my hosting service saying that they give up PHP 5.3, and we had to upgrade our tools to be sure they work with PHP 5.5

Upgrade seemed to work well, but when I connected to my site, I got two similar errors (see the first one below). I am not at all an expert, and do not know what to do. Thanks in advance for any idea.

--- (after adding $wgShowExceptionDetails = true; to LocalSettings.php)

MediaWiki internal error.

Original exception: [efa45635] /MediaWiki/index.php?title=Welcome MWException from line 185 of /home/apsoptim/www/MediaWiki/includes/Hooks.php: Invalid callback SpecialMyLanguage::linkfix in hooks for LinkBegin

Backtrace: -
 * 1) 0 /home/apsoptim/www/MediaWiki/includes/Linker.php(212): Hooks::run(string, array)
 * 2) 1 /home/apsoptim/www/MediaWiki/includes/parser/LinkHolderArray.php(414): Linker::link(Title, string, array, array, array)
 * 3) 2 /home/apsoptim/www/MediaWiki/includes/parser/LinkHolderArray.php(271): LinkHolderArray->replaceInternal(string)
 * 4) 3 /home/apsoptim/www/MediaWiki/includes/parser/Parser.php(5252): LinkHolderArray->replace(string)
 * 5) 4 /home/apsoptim/www/MediaWiki/includes/parser/Parser.php(1295): Parser->replaceLinkHolders(string)
 * 6) 5 /home/apsoptim/www/MediaWiki/includes/parser/Parser.php(437): Parser->internalParseHalfParsed(string, boolean, boolean)
 * 7) 6 /home/apsoptim/www/MediaWiki/includes/content/WikitextContent.php(333): Parser->parse(string, Title, ParserOptions, boolean, boolean, integer)
 * 8) 7 /home/apsoptim/www/MediaWiki/includes/content/AbstractContent.php(497): WikitextContent->fillParserOutput(Title, integer, ParserOptions, boolean, ParserOutput)
 * 9) 8 /home/apsoptim/www/MediaWiki/includes/poolcounter/PoolWorkArticleView.php(140): AbstractContent->getParserOutput(Title, integer, ParserOptions)
 * 10) 9 /home/apsoptim/www/MediaWiki/includes/poolcounter/PoolCounterWork.php(123): PoolWorkArticleView->doWork
 * 11) 10 /home/apsoptim/www/MediaWiki/includes/page/Article.php(674): PoolCounterWork->execute
 * 12) 11 /home/apsoptim/www/MediaWiki/includes/actions/ViewAction.php(44): Article->view
 * 13) 12 /home/apsoptim/www/MediaWiki/includes/MediaWiki.php(395): ViewAction->show
 * 14) 13 /home/apsoptim/www/MediaWiki/includes/MediaWiki.php(273): MediaWiki->performAction(Article, Title)
 * 15) 14 /home/apsoptim/www/MediaWiki/includes/MediaWiki.php(566): MediaWiki->performRequest
 * 16) 15 /home/apsoptim/www/MediaWiki/includes/MediaWiki.php(414): MediaWiki->main
 * 17) 16 /home/apsoptim/www/MediaWiki/index.php(41): MediaWiki->run
 * 18) 17 {main}