MediaWiki internal error.

Original exception: [290e54af190973cdd4eaceb0] /index.php?title=Speci%C3%A1ln%C3%AD:Co_odkazuje_na&target=Rikytan DBQueryError from line 934 of /var/www/clients/client1/web9/web/includes/db/Database.php: A database error has occurred. Did you forget to run maintenance/update.php after upgrading? See: https://www.mediawiki.org/wiki/Manual:Upgrading#Run_the_update_script
Query: SELECT page_id,page_len,page_is_redirect,page_latest,page_content_model FROM `sc2_page` WHERE page_namespace = '0' AND page_title = 'Rikytan' LIMIT 1
Function: LinkCache::addLinkObj
Error: 1054 Unknown column 'page_content_model' in 'field list' (localhost)

Backtrace:
#0 /var/www/clients/client1/web9/web/includes/db/Database.php(901): DatabaseBase->reportQueryError(string, integer, string, string, boolean)
#1 /var/www/clients/client1/web9/web/includes/db/Database.php(1234): DatabaseBase->query(string, string)
#2 /var/www/clients/client1/web9/web/includes/db/Database.php(1293): DatabaseBase->select(string, array, array, string, array, array)
#3 /var/www/clients/client1/web9/web/includes/cache/LinkCache.php(264): DatabaseBase->selectRow(string, array, array, string)
#4 /var/www/clients/client1/web9/web/includes/Title.php(3217): LinkCache->addLinkObj(Title)
#5 /var/www/clients/client1/web9/web/includes/Title.php(3234): Title->getArticleID(integer)
#6 /var/www/clients/client1/web9/web/includes/OutputPage.php(1028): Title->isRedirect()
#7 /var/www/clients/client1/web9/web/includes/OutputPage.php(1042): OutputPage::buildBacklinkSubtitle(Title, array)
#8 /var/www/clients/client1/web9/web/includes/specials/SpecialWhatlinkshere.php(89): OutputPage->addBacklinkSubtitle(Title)
#9 /var/www/clients/client1/web9/web/includes/specialpage/SpecialPage.php(522): SpecialWhatLinksHere->execute(NULL)
#10 /var/www/clients/client1/web9/web/includes/specialpage/SpecialPageFactory.php(577): SpecialPage->run(NULL)
#11 /var/www/clients/client1/web9/web/includes/MediaWiki.php(282): SpecialPageFactory::executePath(Title, RequestContext)
#12 /var/www/clients/client1/web9/web/includes/MediaWiki.php(735): MediaWiki->performRequest()
#13 /var/www/clients/client1/web9/web/includes/MediaWiki.php(509): MediaWiki->main()
#14 /var/www/clients/client1/web9/web/index.php(43): MediaWiki->run()
#15 {main}

Exception caught inside exception handler: [290e54af190973cdd4eaceb0] /index.php?title=Speci%C3%A1ln%C3%AD:Co_odkazuje_na&target=Rikytan DBQueryError from line 934 of /var/www/clients/client1/web9/web/includes/db/Database.php: A database error has occurred. Did you forget to run maintenance/update.php after upgrading? See: https://www.mediawiki.org/wiki/Manual:Upgrading#Run_the_update_script
Query: SELECT page_id,page_namespace,page_title,page_len,page_is_redirect,page_latest,page_content_model FROM `sc2_page` WHERE (page_namespace = '1' AND page_title = 'Rikytan')
Function: LinkBatch::doQuery (for Skin::preloadExistence)
Error: 1054 Unknown column 'page_content_model' in 'field list' (localhost)

Backtrace:
#0 /var/www/clients/client1/web9/web/includes/db/Database.php(901): DatabaseBase->reportQueryError(string, integer, string, string, boolean)
#1 /var/www/clients/client1/web9/web/includes/db/Database.php(1234): DatabaseBase->query(string, string)
#2 /var/www/clients/client1/web9/web/includes/cache/LinkBatch.php(208): DatabaseBase->select(string, array, string, string)
#3 /var/www/clients/client1/web9/web/includes/cache/LinkBatch.php(132): LinkBatch->doQuery()
#4 /var/www/clients/client1/web9/web/includes/cache/LinkBatch.php(121): LinkBatch->executeInto(LinkCache)
#5 /var/www/clients/client1/web9/web/includes/skins/Skin.php(228): LinkBatch->execute()
#6 /var/www/clients/client1/web9/web/includes/skins/Skin.php(146): Skin->preloadExistence()
#7 /var/www/clients/client1/web9/web/includes/skins/SkinFallback.php(33): Skin->initPage(OutputPage)
#8 /var/www/clients/client1/web9/web/includes/skins/SkinTemplate.php(245): SkinFallback->initPage(OutputPage)
#9 /var/www/clients/client1/web9/web/includes/OutputPage.php(2335): SkinTemplate->outputPage()
#10 /var/www/clients/client1/web9/web/includes/exception/MWException.php(206): OutputPage->output()
#11 /var/www/clients/client1/web9/web/includes/exception/MWException.php(246): MWException->reportHTML()
#12 /var/www/clients/client1/web9/web/includes/exception/MWExceptionHandler.php(69): MWException->report()
#13 /var/www/clients/client1/web9/web/includes/exception/MWExceptionHandler.php(180): MWExceptionHandler::report(DBQueryError)
#14 /var/www/clients/client1/web9/web/includes/MediaWiki.php(518): MWExceptionHandler::handleException(DBQueryError)
#15 /var/www/clients/client1/web9/web/index.php(43): MediaWiki->run()
#16 {main}