MediaWiki internal error.

Original exception: [ZgaRWl6WU8Yv67dPtKv1lQAAAJU] /wiki/Module:Category_handler/config MWUnknownContentModelException: The content model 'Scribunto' is not registered on this wiki.
See https://www.mediawiki.org/wiki/Content_handlers to find out which extensions handle this content model.
Backtrace:
from /home1/cityadel/public_html/mw/includes/content/ContentHandlerFactory.php(192)
#0 /home1/cityadel/public_html/mw/includes/content/ContentHandlerFactory.php(247): MediaWiki\Content\ContentHandlerFactory->validateContentHandler(string, NULL)
#1 /home1/cityadel/public_html/mw/includes/content/ContentHandlerFactory.php(181): MediaWiki\Content\ContentHandlerFactory->createContentHandlerFromHook(string)
#2 /home1/cityadel/public_html/mw/includes/content/ContentHandlerFactory.php(93): MediaWiki\Content\ContentHandlerFactory->createForModelID(string)
#3 /home1/cityadel/public_html/mw/includes/title/Title.php(3687): MediaWiki\Content\ContentHandlerFactory->getContentHandler(string)
#4 /home1/cityadel/public_html/mw/includes/parser/ParserOptions.php(1444): MediaWiki\Title\Title->getPageLanguage()
#5 /home1/cityadel/public_html/mw/includes/parser/ParserCache.php(293): ParserOptions->optionsHash(array, MediaWiki\Title\Title)
#6 /home1/cityadel/public_html/mw/includes/page/ParserOutputAccess.php(217): ParserCache->makeParserOutputKey(WikiPage, ParserOptions)
#7 /home1/cityadel/public_html/mw/includes/page/Article.php(650): MediaWiki\Page\ParserOutputAccess->getCachedParserOutput(WikiPage, ParserOptions, NULL, integer)
#8 /home1/cityadel/public_html/mw/includes/page/Article.php(550): Article->generateContentOutput(MediaWiki\User\User, ParserOptions, integer, MediaWiki\Output\OutputPage, array)
#9 /home1/cityadel/public_html/mw/includes/actions/ViewAction.php(78): Article->view()
#10 /home1/cityadel/public_html/mw/includes/MediaWiki.php(583): ViewAction->show()
#11 /home1/cityadel/public_html/mw/includes/MediaWiki.php(363): MediaWiki->performAction(Article, MediaWiki\Title\Title)
#12 /home1/cityadel/public_html/mw/includes/MediaWiki.php(960): MediaWiki->performRequest()
#13 /home1/cityadel/public_html/mw/includes/MediaWiki.php(613): MediaWiki->main()
#14 /home1/cityadel/public_html/mw/index.php(50): MediaWiki->run()
#15 /home1/cityadel/public_html/mw/index.php(46): wfIndexMain()
#16 {main}

Exception caught inside exception handler: [ZgaRWl6WU8Yv67dPtKv1lQAAAJU] /wiki/Module:Category_handler/config MWUnknownContentModelException: The content model 'Scribunto' is not registered on this wiki.
See https://www.mediawiki.org/wiki/Content_handlers to find out which extensions handle this content model.
Backtrace:
from /home1/cityadel/public_html/mw/includes/content/ContentHandlerFactory.php(192)
#0 /home1/cityadel/public_html/mw/includes/content/ContentHandlerFactory.php(247): MediaWiki\Content\ContentHandlerFactory->validateContentHandler(string, NULL)
#1 /home1/cityadel/public_html/mw/includes/content/ContentHandlerFactory.php(181): MediaWiki\Content\ContentHandlerFactory->createContentHandlerFromHook(string)
#2 /home1/cityadel/public_html/mw/includes/content/ContentHandlerFactory.php(93): MediaWiki\Content\ContentHandlerFactory->createForModelID(string)
#3 /home1/cityadel/public_html/mw/includes/title/Title.php(3687): MediaWiki\Content\ContentHandlerFactory->getContentHandler(string)
#4 /home1/cityadel/public_html/mw/includes/skins/SkinTemplate.php(1299): MediaWiki\Title\Title->getPageLanguage()
#5 /home1/cityadel/public_html/mw/includes/skins/SkinTemplate.php(604): SkinTemplate->buildContentNavigationUrlsInternal()
#6 /home1/cityadel/public_html/mw/includes/skins/SkinTemplate.php(181): SkinTemplate->getPortletsTemplateData()
#7 /home1/cityadel/public_html/mw/includes/skins/SkinMustache.php(125): SkinTemplate->getTemplateData()
#8 /home1/cityadel/public_html/mw/skins/Vector/includes/SkinVectorLegacy.php(161): SkinMustache->getTemplateData()
#9 /home1/cityadel/public_html/mw/includes/skins/SkinMustache.php(92): MediaWiki\Skins\Vector\SkinVectorLegacy->getTemplateData()
#10 /home1/cityadel/public_html/mw/includes/skins/SkinTemplate.php(174): SkinMustache->generateHTML()
#11 /home1/cityadel/public_html/mw/includes/Output/OutputPage.php(2947): SkinTemplate->outputPage()
#12 /home1/cityadel/public_html/mw/includes/exception/MWExceptionRenderer.php(188): MediaWiki\Output\OutputPage->output()
#13 /home1/cityadel/public_html/mw/includes/exception/MWExceptionRenderer.php(105): MWExceptionRenderer::reportHTML(MWUnknownContentModelException)
#14 /home1/cityadel/public_html/mw/includes/exception/MWExceptionHandler.php(134): MWExceptionRenderer::output(MWUnknownContentModelException, integer)
#15 /home1/cityadel/public_html/mw/includes/exception/MWExceptionHandler.php(251): MWExceptionHandler::report(MWUnknownContentModelException)
#16 /home1/cityadel/public_html/mw/includes/MediaWiki.php(632): MWExceptionHandler::handleException(MWUnknownContentModelException, string)
#17 /home1/cityadel/public_html/mw/index.php(50): MediaWiki->run()
#18 /home1/cityadel/public_html/mw/index.php(46): wfIndexMain()
#19 {main}