Exception encountered, of type "Error"
[204806bc] /index.php?title=Test&diff=prev&oldid=2329 Error from line 40 of /var/www/html/mediawiki/extensions/Ontology/Ontology.php: Call to undefined function split()
Backtrace:
#0 /var/www/html/mediawiki/includes/parser/Parser.php(3789): Ontology->expandOntologyTree(Parser, string, string, string, string, string)
#1 /var/www/html/mediawiki/includes/parser/Parser.php(3523): Parser->callParserFunction(PPFrame_DOM, string, array)
#2 /var/www/html/mediawiki/includes/parser/Preprocessor_DOM.php(1177): Parser->braceSubstitution(array, PPFrame_DOM)
#3 /var/www/html/mediawiki/includes/parser/Parser.php(3342): PPFrame_DOM->expand(DOMElement, integer)
#4 /var/www/html/mediawiki/includes/parser/Parser.php(1239): Parser->replaceVariables(string)
#5 /var/www/html/mediawiki/includes/parser/Parser.php(439): Parser->internalParse(string)
#6 /var/www/html/mediawiki/includes/content/WikitextContent.php(331): Parser->parse(string, Title, ParserOptions, boolean, boolean, integer)
#7 /var/www/html/mediawiki/includes/content/AbstractContent.php(497): WikitextContent->fillParserOutput(Title, integer, ParserOptions, boolean, ParserOutput)
#8 /var/www/html/mediawiki/includes/poolcounter/PoolWorkArticleView.php(139): AbstractContent->getParserOutput(Title, integer, ParserOptions)
#9 /var/www/html/mediawiki/includes/poolcounter/PoolCounterWork.php(123): PoolWorkArticleView->doWork()
#10 /var/www/html/mediawiki/includes/page/WikiPage.php(1126): PoolCounterWork->execute()
#11 /var/www/html/mediawiki/includes/diff/DifferenceEngine.php(616): WikiPage->getParserOutput(ParserOptions, integer)
#12 /var/www/html/mediawiki/includes/diff/DifferenceEngine.php(594): DifferenceEngine->getParserOutput(WikiPage, Revision)
#13 /var/www/html/mediawiki/includes/diff/DifferenceEngine.php(455): DifferenceEngine->renderNewRevision()
#14 /var/www/html/mediawiki/includes/page/Article.php(797): DifferenceEngine->showDiffPage(boolean)
#15 /var/www/html/mediawiki/includes/page/Article.php(508): Article->showDiffPage()
#16 /var/www/html/mediawiki/includes/actions/ViewAction.php(44): Article->view()
#17 /var/www/html/mediawiki/includes/MediaWiki.php(490): ViewAction->show()
#18 /var/www/html/mediawiki/includes/MediaWiki.php(287): MediaWiki->performAction(Article, Title)
#19 /var/www/html/mediawiki/includes/MediaWiki.php(714): MediaWiki->performRequest()
#20 /var/www/html/mediawiki/includes/MediaWiki.php(508): MediaWiki->main()
#21 /var/www/html/mediawiki/index.php(41): MediaWiki->run()
#22 {main}