Warning: include(/usr/share/mediawiki-extensions/base/ExtensionFunctions.php): failed to open stream: No such file or directory in /etc/mediawiki-extensions/extensions.php on line 4

Warning: include(): Failed opening '/usr/share/mediawiki-extensions/base/ExtensionFunctions.php' for inclusion (include_path='/var/lib/mediawiki:/var/lib/mediawiki/includes:/var/lib/mediawiki/languages:/usr/share/mediawiki/vendor/pear/pear_exception:/usr/share/mediawiki/vendor/pear/console_getopt:/usr/share/mediawiki/vendor/pear/pear-core-minimal/src:/usr/share/mediawiki/vendor/pear/mail_mime:/usr/share/mediawiki/vendor/pear/net_socket:/usr/share/mediawiki/vendor/pear/net_smtp:/usr/share/mediawiki/vendor/pear/mail:.:/usr/share/php:/usr/share/pear') in /etc/mediawiki-extensions/extensions.php on line 4
MediaWiki internal error.

Original exception: [441591fc973a4ec25bea0c88] /wiki/index.php?title=Special:WhatLinksHere/Linux_distributions_without_systemd&limit=250&hideredirs=1 DBQueryError from line 934 of /usr/share/mediawiki/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 `page` WHERE page_namespace = '0' AND page_title = 'Linux_distributions_without_systemd' LIMIT 1
Function: LinkCache::addLinkObj
Error: 1054 Unknown column 'page_content_model' in 'field list' (localhost)

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

Exception caught inside exception handler: [441591fc973a4ec25bea0c88] /wiki/index.php?title=Special:WhatLinksHere/Linux_distributions_without_systemd&limit=250&hideredirs=1 DBQueryError from line 934 of /usr/share/mediawiki/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 `page` WHERE (page_namespace = '1' AND page_title = 'Linux_distributions_without_systemd')
Function: LinkBatch::doQuery (for Skin::preloadExistence)
Error: 1054 Unknown column 'page_content_model' in 'field list' (localhost)

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