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Internal error

[d13a022d253bbd29830175dc] /index.php?title=British_WW2_Codebreaking&diff=19431&oldid=15128 Error from line 226 of /var/www/html/mediawiki/extensions/MediawikiPlayer/MediawikiPlayer.php: Call to undefined method Xml::escapeJsString()

Backtrace:

#0 /var/www/html/mediawiki/includes/parser/Parser.php(3888): MediawikiPlayer::render(string, array, Parser, PPFrame_DOM)
#1 /var/www/html/mediawiki/includes/parser/Preprocessor_DOM.php(1362): Parser->extensionSubstitution(array, PPFrame_DOM)
#2 /var/www/html/mediawiki/includes/parser/Parser.php(2942): PPFrame_DOM->expand(DOMElement, integer)
#3 /var/www/html/mediawiki/includes/parser/Parser.php(1293): Parser->replaceVariables(string)
#4 /var/www/html/mediawiki/includes/parser/Parser.php(443): Parser->internalParse(string)
#5 /var/www/html/mediawiki/includes/content/WikitextContent.php(323): Parser->parse(string, Title, ParserOptions, boolean, boolean, integer)
#6 /var/www/html/mediawiki/includes/content/AbstractContent.php(516): WikitextContent->fillParserOutput(Title, integer, ParserOptions, boolean, ParserOutput)
#7 /var/www/html/mediawiki/includes/poolcounter/PoolWorkArticleView.php(144): AbstractContent->getParserOutput(Title, integer, ParserOptions)
#8 /var/www/html/mediawiki/includes/poolcounter/PoolCounterWork.php(123): PoolWorkArticleView->doWork()
#9 /var/www/html/mediawiki/includes/page/WikiPage.php(1134): PoolCounterWork->execute()
#10 /var/www/html/mediawiki/includes/diff/DifferenceEngine.php(661): WikiPage->getParserOutput(ParserOptions, integer)
#11 /var/www/html/mediawiki/includes/diff/DifferenceEngine.php(629): DifferenceEngine->getParserOutput(WikiPage, Revision)
#12 /var/www/html/mediawiki/includes/diff/DifferenceEngine.php(480): DifferenceEngine->renderNewRevision()
#13 /var/www/html/mediawiki/includes/page/Article.php(737): DifferenceEngine->showDiffPage(boolean)
#14 /var/www/html/mediawiki/includes/page/Article.php(464): Article->showDiffPage()
#15 /var/www/html/mediawiki/includes/actions/ViewAction.php(68): Article->view()
#16 /var/www/html/mediawiki/includes/MediaWiki.php(500): ViewAction->show()
#17 /var/www/html/mediawiki/includes/MediaWiki.php(294): MediaWiki->performAction(Article, Title)
#18 /var/www/html/mediawiki/includes/MediaWiki.php(861): MediaWiki->performRequest()
#19 /var/www/html/mediawiki/includes/MediaWiki.php(524): MediaWiki->main()
#20 /var/www/html/mediawiki/index.php(42): MediaWiki->run()
#21 {main}