MediaWiki internal error.

Original exception: [09b61f7dc0c4d774e6d0c665] /w/index.php/Wiki:Current_events DBQueryError from line 1054 of /var/www/html/w/includes/libs/rdbms/database/Database.php: A database query error has occurred. Did you forget to run your application's database schema updater after upgrading?
Query: SELECT page_title,old_text,old_flags FROM `mw_page`,`mw_revision`,`mw_text` WHERE page_is_redirect = '0' AND page_namespace = '8' AND (page_title NOT LIKE '%/%' ) AND (page_latest=rev_id) AND (rev_text_id=old_id) AND (page_len <= 10000)
Function: MessageCache::loadFromDB(en)-small
Error: 1054 Unknown column 'rev_text_id' in 'where clause' (localhost)

Backtrace:
#0 /var/www/html/w/includes/libs/rdbms/database/Database.php(912): Database->reportQueryError()
#1 /var/www/html/w/includes/libs/rdbms/database/Database.php(1254): Database->query()
#2 /var/www/html/w/includes/cache/MessageCache.php(495): Database->select()
#3 /var/www/html/w/includes/cache/MessageCache.php(403): MessageCache->loadFromDB()
#4 /var/www/html/w/includes/cache/MessageCache.php(325): MessageCache->loadFromDBWithLock()
#5 /var/www/html/w/includes/cache/MessageCache.php(927): MessageCache->load()
#6 /var/www/html/w/includes/cache/MessageCache.php(856): MessageCache->getMsgFromNamespace()
#7 /var/www/html/w/includes/cache/MessageCache.php(826): MessageCache->getMessageForLang()
#8 /var/www/html/w/includes/cache/MessageCache.php(766): MessageCache->getMessageFromFallbackChain()
#9 /var/www/html/w/includes/Message.php(1188): MessageCache->get()
#10 /var/www/html/w/includes/Message.php(802): Message->fetchMessage()
#11 /var/www/html/w/includes/Message.php(902): Message->toString()
#12 /var/www/html/w/includes/Title.php(557): Message->text()
#13 /var/www/html/w/includes/OutputPage.php(2453): Title::newMainPage()
#14 /var/www/html/w/includes/exception/PermissionsError.php(66): OutputPage->showPermissionsErrorPage()
#15 /var/www/html/w/includes/MediaWiki.php(518): PermissionsError->report()
#16 /var/www/html/w/index.php(43): MediaWiki->run()
#17 {main}

Exception caught inside exception handler: [09b61f7dc0c4d774e6d0c665] /w/index.php/Wiki:Current_events DBQueryError from line 1054 of /var/www/html/w/includes/libs/rdbms/database/Database.php: A database query error has occurred. Did you forget to run your application's database schema updater after upgrading?
Query: SELECT page_title,old_text,old_flags FROM `mw_page`,`mw_revision`,`mw_text` WHERE page_is_redirect = '0' AND page_namespace = '8' AND (page_title NOT LIKE '%/%' ) AND (page_latest=rev_id) AND (rev_text_id=old_id) AND (page_len <= 10000)
Function: MessageCache::loadFromDB(en)-small
Error: 1054 Unknown column 'rev_text_id' in 'where clause' (localhost)

Backtrace:
#0 /var/www/html/w/includes/libs/rdbms/database/Database.php(912): Database->reportQueryError()
#1 /var/www/html/w/includes/libs/rdbms/database/Database.php(1254): Database->query()
#2 /var/www/html/w/includes/cache/MessageCache.php(495): Database->select()
#3 /var/www/html/w/includes/cache/MessageCache.php(403): MessageCache->loadFromDB()
#4 /var/www/html/w/includes/cache/MessageCache.php(325): MessageCache->loadFromDBWithLock()
#5 /var/www/html/w/includes/cache/MessageCache.php(927): MessageCache->load()
#6 /var/www/html/w/includes/cache/MessageCache.php(856): MessageCache->getMsgFromNamespace()
#7 /var/www/html/w/includes/cache/MessageCache.php(826): MessageCache->getMessageForLang()
#8 /var/www/html/w/includes/cache/MessageCache.php(766): MessageCache->getMessageFromFallbackChain()
#9 /var/www/html/w/includes/Message.php(1188): MessageCache->get()
#10 /var/www/html/w/includes/Message.php(802): Message->fetchMessage()
#11 /var/www/html/w/includes/Message.php(902): Message->toString()
#12 /var/www/html/w/includes/OutputPage.php(906): Message->text()
#13 /var/www/html/w/includes/OutputPage.php(953): OutputPage->setHTMLTitle()
#14 /var/www/html/w/includes/OutputPage.php(2369): OutputPage->setPageTitle()
#15 /var/www/html/w/includes/exception/MWExceptionRenderer.php(162): OutputPage->prepareErrorPage()
#16 /var/www/html/w/includes/exception/MWExceptionRenderer.php(50): MWExceptionRenderer::reportHTML()
#17 /var/www/html/w/includes/exception/MWExceptionHandler.php(71): MWExceptionRenderer::output()
#18 /var/www/html/w/includes/exception/MWExceptionHandler.php(137): MWExceptionHandler::report()
#19 /var/www/html/w/includes/MediaWiki.php(540): MWExceptionHandler::handleException()
#20 /var/www/html/w/index.php(43): MediaWiki->run()
#21 {main}