MediaWiki internal error.

Original exception: [ZgXJg9nmCNy5ik4KAq2G0gAAAAI] /Discussion_utilisateur:Atsarb 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 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/content/ContentHandlerFactory.php(192)
#0 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/content/ContentHandlerFactory.php(247): MediaWiki\Content\ContentHandlerFactory->validateContentHandler()
#1 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/content/ContentHandlerFactory.php(181): MediaWiki\Content\ContentHandlerFactory->createContentHandlerFromHook()
#2 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/content/ContentHandlerFactory.php(93): MediaWiki\Content\ContentHandlerFactory->createForModelID()
#3 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/page/WikiPage.php(253): MediaWiki\Content\ContentHandlerFactory->getContentHandler()
#4 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/actions/ActionEntryPoint.php(638): WikiPage->getContentHandler()
#5 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/actions/ActionEntryPoint.php(516): MediaWiki\Actions\ActionEntryPoint->initializeArticle()
#6 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/actions/ActionEntryPoint.php(153): MediaWiki\Actions\ActionEntryPoint->performRequest()
#7 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/MediaWikiEntryPoint.php(185): MediaWiki\Actions\ActionEntryPoint->execute()
#8 /var/www/vhosts/fallout-wiki.com/httpdocs/index.php(55): MediaWiki\MediaWikiEntryPoint->run()
#9 {main}

Exception caught inside exception handler: [ZgXJg9nmCNy5ik4KAq2G0gAAAAI] /Discussion_utilisateur:Atsarb 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 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/content/ContentHandlerFactory.php(192)
#0 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/content/ContentHandlerFactory.php(247): MediaWiki\Content\ContentHandlerFactory->validateContentHandler()
#1 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/content/ContentHandlerFactory.php(181): MediaWiki\Content\ContentHandlerFactory->createContentHandlerFromHook()
#2 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/content/ContentHandlerFactory.php(93): MediaWiki\Content\ContentHandlerFactory->createForModelID()
#3 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/page/WikiPage.php(253): MediaWiki\Content\ContentHandlerFactory->getContentHandler()
#4 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/page/WikiPage.php(239): WikiPage->getContentHandler()
#5 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/page/Article.php(2003): WikiPage->getActionOverrides()
#6 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/actions/ActionFactory.php(260): Article->getActionOverrides()
#7 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/actions/ActionFactory.php(406): MediaWiki\Actions\ActionFactory->getAction()
#8 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/context/RequestContext.php(306): MediaWiki\Actions\ActionFactory->getActionName()
#9 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/context/ContextSource.php(134): RequestContext->getActionName()
#10 /var/www/vhosts/fallout-wiki.com/httpdocs/extensions/CharInsert/includes/Hooks.php(12): ContextSource->getActionName()
#11 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/HookContainer/HookContainer.php(159): MediaWiki\Extension\CharInsert\Hooks->onBeforePageDisplay()
#12 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/HookContainer/HookRunner.php(939): MediaWiki\HookContainer\HookContainer->run()
#13 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/Output/OutputPage.php(3010): MediaWiki\HookContainer\HookRunner->onBeforePageDisplay()
#14 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/exception/MWExceptionRenderer.php(188): MediaWiki\Output\OutputPage->output()
#15 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/exception/MWExceptionRenderer.php(105): MWExceptionRenderer::reportHTML()
#16 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/exception/MWExceptionHandler.php(133): MWExceptionRenderer::output()
#17 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/exception/MWExceptionHandler.php(237): MWExceptionHandler::report()
#18 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/MediaWikiEntryPoint.php(206): MWExceptionHandler::handleException()
#19 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/actions/ActionEntryPoint.php(90): MediaWiki\MediaWikiEntryPoint->handleTopLevelError()
#20 /var/www/vhosts/fallout-wiki.com/httpdocs/includes/MediaWikiEntryPoint.php(190): MediaWiki\Actions\ActionEntryPoint->handleTopLevelError()
#21 /var/www/vhosts/fallout-wiki.com/httpdocs/index.php(55): MediaWiki\MediaWikiEntryPoint->run()
#22 {main}