Exception encountered, of type "Error"
[f007c40dba480c81477b2114] /w/index.php?title=%E7%89%B9%E5%88%A5:%E7%89%B9%E5%88%A5%E3%83%9A%E3%83%BC%E3%82%B8%E4%B8%80%E8%A6%A7&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(70): MobileFormatter->filterContent()
#2 /home/web/arl.jp/w/extensions/MobileFrontend/includes/MobileFrontend.hooks.php(210): ExtMobileFrontend::DOMParse()
#3 /home/web/arl.jp/w/includes/Hooks.php(195): MobileFrontendHooks::onOutputPageBeforeHTML()
#4 /home/web/arl.jp/w/includes/OutputPage.php(1848): Hooks::run()
#5 /home/web/arl.jp/w/includes/OutputPage.php(1866): OutputPage->addParserOutputText()
#6 /home/web/arl.jp/w/includes/OutputPage.php(1743): OutputPage->addParserOutput()
#7 /home/web/arl.jp/w/includes/OutputPage.php(1681): OutputPage->addWikiTextTitle()
#8 /home/web/arl.jp/w/includes/OutputPage.php(4012): OutputPage->addWikiText()
#9 /home/web/arl.jp/w/includes/specials/SpecialSpecialpages.php(102): OutputPage->wrapWikiMsg()
#10 /home/web/arl.jp/w/includes/specials/SpecialSpecialpages.php(49): SpecialSpecialpages->outputPageList()
#11 /home/web/arl.jp/w/includes/specialpage/SpecialPage.php(479): SpecialSpecialpages->execute()
#12 /home/web/arl.jp/w/includes/specialpage/SpecialPageFactory.php(577): SpecialPage->run()
#13 /home/web/arl.jp/w/includes/MediaWiki.php(282): SpecialPageFactory::executePath()
#14 /home/web/arl.jp/w/includes/MediaWiki.php(735): MediaWiki->performRequest()
#15 /home/web/arl.jp/w/includes/MediaWiki.php(509): MediaWiki->main()
#16 /home/web/arl.jp/w/index.php(43): MediaWiki->run()
#17 {main}