MediaWiki internal error.

Original exception: [87af67c0c2dca1be17e34fd8] /index.php?title=Usuario_discusi%C3%B3n:Carlos_Pazo&action=edit&redlink=1 MWUnknownContentModelException: The content model 'flow-board' 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 /home/u256367478/domains/musiki.org.ar/public_html/includes/content/ContentHandlerFactory.php(203)
#0 /home/u256367478/domains/musiki.org.ar/public_html/includes/content/ContentHandlerFactory.php(273): MediaWiki\Content\ContentHandlerFactory->validateContentHandler(string, NULL)
#1 /home/u256367478/domains/musiki.org.ar/public_html/includes/content/ContentHandlerFactory.php(191): MediaWiki\Content\ContentHandlerFactory->createContentHandlerFromHook(string)
#2 /home/u256367478/domains/musiki.org.ar/public_html/includes/content/ContentHandlerFactory.php(97): MediaWiki\Content\ContentHandlerFactory->createForModelID(string)
#3 /home/u256367478/domains/musiki.org.ar/public_html/includes/page/WikiPage.php(311): MediaWiki\Content\ContentHandlerFactory->getContentHandler(string)
#4 /home/u256367478/domains/musiki.org.ar/public_html/includes/MediaWiki.php(448): WikiPage->getContentHandler()
#5 /home/u256367478/domains/musiki.org.ar/public_html/includes/MediaWiki.php(331): MediaWiki->initializeArticle()
#6 /home/u256367478/domains/musiki.org.ar/public_html/includes/MediaWiki.php(923): MediaWiki->performRequest()
#7 /home/u256367478/domains/musiki.org.ar/public_html/includes/MediaWiki.php(576): MediaWiki->main()
#8 /home/u256367478/domains/musiki.org.ar/public_html/index.php(50): MediaWiki->run()
#9 /home/u256367478/domains/musiki.org.ar/public_html/index.php(46): wfIndexMain()
#10 {main}

Exception caught inside exception handler: [87af67c0c2dca1be17e34fd8] /index.php?title=Usuario_discusi%C3%B3n:Carlos_Pazo&action=edit&redlink=1 MWUnknownContentModelException: The content model 'flow-board' 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 /home/u256367478/domains/musiki.org.ar/public_html/includes/content/ContentHandlerFactory.php(203)
#0 /home/u256367478/domains/musiki.org.ar/public_html/includes/content/ContentHandlerFactory.php(273): MediaWiki\Content\ContentHandlerFactory->validateContentHandler(string, NULL)
#1 /home/u256367478/domains/musiki.org.ar/public_html/includes/content/ContentHandlerFactory.php(191): MediaWiki\Content\ContentHandlerFactory->createContentHandlerFromHook(string)
#2 /home/u256367478/domains/musiki.org.ar/public_html/includes/content/ContentHandlerFactory.php(97): MediaWiki\Content\ContentHandlerFactory->createForModelID(string)
#3 /home/u256367478/domains/musiki.org.ar/public_html/includes/page/WikiPage.php(311): MediaWiki\Content\ContentHandlerFactory->getContentHandler(string)
#4 /home/u256367478/domains/musiki.org.ar/public_html/includes/page/WikiPage.php(297): WikiPage->getContentHandler()
#5 /home/u256367478/domains/musiki.org.ar/public_html/includes/page/Article.php(2112): WikiPage->getActionOverrides()
#6 /home/u256367478/domains/musiki.org.ar/public_html/includes/actions/ActionFactory.php(270): Article->getActionOverrides()
#7 /home/u256367478/domains/musiki.org.ar/public_html/includes/actions/ActionFactory.php(373): MediaWiki\Actions\ActionFactory->getAction(string, Article, RequestContext)
#8 /home/u256367478/domains/musiki.org.ar/public_html/includes/context/RequestContext.php(291): MediaWiki\Actions\ActionFactory->getActionName(RequestContext)
#9 /home/u256367478/domains/musiki.org.ar/public_html/includes/context/ContextSource.php(130): RequestContext->getActionName()
#10 /home/u256367478/domains/musiki.org.ar/public_html/extensions/DiscussionTools/includes/Hooks/HookUtils.php(385): ContextSource->getActionName()
#11 /home/u256367478/domains/musiki.org.ar/public_html/extensions/DiscussionTools/includes/Hooks/PageHooks.php(88): MediaWiki\Extension\DiscussionTools\Hooks\HookUtils::isFeatureEnabledForOutput(OutputPage, string)
#12 /home/u256367478/domains/musiki.org.ar/public_html/includes/HookContainer/HookContainer.php(160): MediaWiki\Extension\DiscussionTools\Hooks\PageHooks->onBeforePageDisplay(OutputPage, MediaWiki\Skins\Vector\SkinVector22)
#13 /home/u256367478/domains/musiki.org.ar/public_html/includes/HookContainer/HookRunner.php(941): MediaWiki\HookContainer\HookContainer->run(string, array, array)
#14 /home/u256367478/domains/musiki.org.ar/public_html/includes/OutputPage.php(2894): MediaWiki\HookContainer\HookRunner->onBeforePageDisplay(OutputPage, MediaWiki\Skins\Vector\SkinVector22)
#15 /home/u256367478/domains/musiki.org.ar/public_html/includes/exception/MWException.php(184): OutputPage->output()
#16 /home/u256367478/domains/musiki.org.ar/public_html/includes/exception/MWException.php(218): MWException->reportHTML()
#17 /home/u256367478/domains/musiki.org.ar/public_html/includes/exception/MWExceptionHandler.php(130): MWException->report()
#18 /home/u256367478/domains/musiki.org.ar/public_html/includes/exception/MWExceptionHandler.php(249): MWExceptionHandler::report(MWUnknownContentModelException)
#19 /home/u256367478/domains/musiki.org.ar/public_html/includes/MediaWiki.php(595): MWExceptionHandler::handleException(MWUnknownContentModelException, string)
#20 /home/u256367478/domains/musiki.org.ar/public_html/index.php(50): MediaWiki->run()
#21 /home/u256367478/domains/musiki.org.ar/public_html/index.php(46): wfIndexMain()
#22 {main}