Interner Fehler

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[ZgXXhvLiHBD5vuh7t0Km3AAAAE8] /doc/index.php?title=Modify_Preview&diff=6837&oldid=6836 Error from line 226 of /home/www-data/apache2/doc.umbrella.ch/doc/extensions/MediawikiPlayer/MediawikiPlayer.php: Call to undefined method Xml::escapeJsString()

Backtrace:

#0 /home/www-data/apache2/doc.umbrella.ch/doc/includes/parser/Parser.php(3882): MediawikiPlayer::render()
#1 /home/www-data/apache2/doc.umbrella.ch/doc/includes/parser/Preprocessor_DOM.php(1284): Parser->extensionSubstitution()
#2 /home/www-data/apache2/doc.umbrella.ch/doc/includes/parser/Parser.php(2942): PPFrame_DOM->expand()
#3 /home/www-data/apache2/doc.umbrella.ch/doc/includes/parser/Parser.php(1297): Parser->replaceVariables()
#4 /home/www-data/apache2/doc.umbrella.ch/doc/includes/parser/Parser.php(451): Parser->internalParse()
#5 /home/www-data/apache2/doc.umbrella.ch/doc/includes/content/WikitextContent.php(330): Parser->parse()
#6 /home/www-data/apache2/doc.umbrella.ch/doc/includes/content/AbstractContent.php(497): WikitextContent->fillParserOutput()
#7 /home/www-data/apache2/doc.umbrella.ch/doc/includes/poolcounter/PoolWorkArticleView.php(139): AbstractContent->getParserOutput()
#8 /home/www-data/apache2/doc.umbrella.ch/doc/includes/poolcounter/PoolCounterWork.php(123): PoolWorkArticleView->doWork()
#9 /home/www-data/apache2/doc.umbrella.ch/doc/includes/page/WikiPage.php(1076): PoolCounterWork->execute()
#10 /home/www-data/apache2/doc.umbrella.ch/doc/includes/diff/DifferenceEngine.php(647): WikiPage->getParserOutput()
#11 /home/www-data/apache2/doc.umbrella.ch/doc/includes/diff/DifferenceEngine.php(620): DifferenceEngine->getParserOutput()
#12 /home/www-data/apache2/doc.umbrella.ch/doc/includes/diff/DifferenceEngine.php(472): DifferenceEngine->renderNewRevision()
#13 /home/www-data/apache2/doc.umbrella.ch/doc/includes/page/Article.php(709): DifferenceEngine->showDiffPage()
#14 /home/www-data/apache2/doc.umbrella.ch/doc/includes/page/Article.php(458): Article->showDiffPage()
#15 /home/www-data/apache2/doc.umbrella.ch/doc/includes/actions/ViewAction.php(68): Article->view()
#16 /home/www-data/apache2/doc.umbrella.ch/doc/includes/MediaWiki.php(499): ViewAction->show()
#17 /home/www-data/apache2/doc.umbrella.ch/doc/includes/MediaWiki.php(293): MediaWiki->performAction()
#18 /home/www-data/apache2/doc.umbrella.ch/doc/includes/MediaWiki.php(862): MediaWiki->performRequest()
#19 /home/www-data/apache2/doc.umbrella.ch/doc/includes/MediaWiki.php(523): MediaWiki->main()
#20 /home/www-data/apache2/doc.umbrella.ch/doc/index.php(43): MediaWiki->run()
#21 {main}