Exception encountered, of type "Error"
[a2379dc2233382562add4073] /w/index.php?title=%E3%83%9E%E3%83%81%E2%98%85%E3%82%A2%E3%82%BD%E3%83%93/Vol.16&action=history&mobileaction=toggle_view_mobile Error from line 79 of /home/web/arl.jp/w/vendor/wikimedia/html-formatter/src/HtmlFormatter.php: Class 'DOMDocument' not found
Backtrace:
#0 /home/web/arl.jp/w/extensions/MobileFrontend/includes/MobileFormatter.php(119): HtmlFormatter\HtmlFormatter->getDoc()
#1 /home/web/arl.jp/w/extensions/MobileFrontend/includes/MobileFrontend.body.php(71): MobileFormatter->filterContent(boolean, boolean, boolean)
#2 /home/web/arl.jp/w/extensions/MobileFrontend/includes/MobileFrontend.hooks.php(210): ExtMobileFrontend::DOMParse(OutputPage, string, boolean)
#3 /home/web/arl.jp/w/includes/Hooks.php(195): MobileFrontendHooks::onOutputPageBeforeHTML(OutputPage, string)
#4 /home/web/arl.jp/w/includes/OutputPage.php(1848): Hooks::run(string, array)
#5 /home/web/arl.jp/w/includes/OutputPage.php(1866): OutputPage->addParserOutputText(ParserOutput)
#6 /home/web/arl.jp/w/includes/OutputPage.php(1743): OutputPage->addParserOutput(ParserOutput)
#7 /home/web/arl.jp/w/includes/OutputPage.php(1681): OutputPage->addWikiTextTitle(string, Title, boolean, boolean, boolean)
#8 /home/web/arl.jp/w/includes/OutputPage.php(4012): OutputPage->addWikiText(string)
#9 /home/web/arl.jp/w/includes/actions/HistoryAction.php(495): OutputPage->wrapWikiMsg(string, string)
#10 /home/web/arl.jp/w/includes/pager/IndexPager.php(430): HistoryPager->getStartBody()
#11 /home/web/arl.jp/w/includes/actions/HistoryAction.php(210): IndexPager->getBody()
#12 /home/web/arl.jp/w/includes/actions/FormlessAction.php(43): HistoryAction->onView()
#13 /home/web/arl.jp/w/includes/MediaWiki.php(493): FormlessAction->show()
#14 /home/web/arl.jp/w/includes/MediaWiki.php(288): MediaWiki->performAction(Article, Title)
#15 /home/web/arl.jp/w/includes/MediaWiki.php(735): MediaWiki->performRequest()
#16 /home/web/arl.jp/w/includes/MediaWiki.php(509): MediaWiki->main()
#17 /home/web/arl.jp/w/index.php(43): MediaWiki->run()
#18 {main}