[ec9654e6b5674407e3aae929] /index.php?title=Special:WhatLinksHere/29_Oct_1993&hidetrans=1 Error: Class "DOMDocument" not found

Backtrace:

from /home/unklewik/public_html/includes/language/LocalisationCache.php(832)
#0 /home/unklewik/public_html/includes/language/LocalisationCache.php(815): LocalisationCache::loadPluralFile()
#1 /home/unklewik/public_html/includes/language/LocalisationCache.php(789): LocalisationCache::loadPluralFiles()
#2 /home/unklewik/public_html/includes/language/LocalisationCache.php(888): LocalisationCache->getPluralRules()
#3 /home/unklewik/public_html/includes/language/LocalisationCache.php(1082): LocalisationCache->readPluralFilesAndRegisterDeps()
#4 /home/unklewik/public_html/includes/language/LocalisationCache.php(608): LocalisationCache->recache()
#5 /home/unklewik/public_html/includes/language/LocalisationCache.php(472): LocalisationCache->initLanguage()
#6 /home/unklewik/public_html/includes/language/LocalisationCache.php(374): LocalisationCache->loadItem()
#7 /home/unklewik/public_html/includes/language/Language.php(3029): LocalisationCache->getItem()
#8 /home/unklewik/public_html/includes/specialpage/SpecialPageFactory.php(1372): Language->getSpecialPageAliases()
#9 /home/unklewik/public_html/includes/specialpage/SpecialPageFactory.php(1433): MediaWiki\SpecialPage\SpecialPageFactory->getAliasList()
#10 /home/unklewik/public_html/includes/title/Title.php(1281): MediaWiki\SpecialPage\SpecialPageFactory->resolveAlias()
#11 /home/unklewik/public_html/includes/MediaWiki.php(241): MediaWiki\Title\Title->isSpecial()
#12 /home/unklewik/public_html/includes/MediaWiki.php(960): MediaWiki->performRequest()
#13 /home/unklewik/public_html/includes/MediaWiki.php(613): MediaWiki->main()
#14 /home/unklewik/public_html/index.php(50): MediaWiki->run()
#15 /home/unklewik/public_html/index.php(46): wfIndexMain()
#16 {main}