MediaWiki internal error.

Original exception: exception 'DBQueryError' with message '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 rev_id,rev_page,rev_text_id,rev_timestamp,rev_comment,rev_user_text,rev_user,rev_minor_edit,rev_deleted,rev_len,rev_parent_id,rev_sha1,page_namespace,page_title,page_id,page_latest,user_name FROM `revision` INNER JOIN `page` ON ((page_id = rev_page)) LEFT JOIN `energypedia`.`user` ON ((rev_user != 0) AND (user_id = rev_user)) WHERE rev_id = '92046' LIMIT 1
Function: Revision::fetchFromConds
Error: 1047 WSREP has not yet prepared node for application use (192.168.42.42:3307)
' in /var/www/ISWiki/prod/releases/20200129140901/lib/includes/db/Database.php:918
Stack trace:
#0 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/db/Database.php(885): DatabaseBase->reportQueryError('WSREP has not y...', 1047, 'SELECT rev_id,...', 'Revision::fetch...', false)
#1 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/db/Database.php(1358): DatabaseBase->query('SELECT rev_id,...', 'Revision::fetch...')
#2 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/Revision.php(298): DatabaseBase->select(Array, Array, Array, 'Revision::fetch...', Array, Array)
#3 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/Revision.php(247): Revision::fetchFromConds(Object(DatabaseMysql), Array)
#4 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/Revision.php(230): Revision::loadFromConds(Object(DatabaseMysql), Array)
#5 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/Revision.php(43): Revision::newFromConds(Array)
#6 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/Article.php(251): Revision::newFromId(92046)
#7 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/Article.php(226): Article->getOldIDFromRequest()
#8 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/Article.php(412): Article->getOldID()
#9 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/ImagePage.php(135): Article->view()
#10 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/actions/ViewAction.php(40): ImagePage->view()
#11 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/Wiki.php(484): ViewAction->show()
#12 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/Wiki.php(278): MediaWiki->performAction(Object(ImagePage))
#13 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/Wiki.php(593): MediaWiki->performRequest()
#14 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/Wiki.php(503): MediaWiki->main()
#15 /var/www/ISWiki/prod/releases/20200129140901/lib/index.php(58): MediaWiki->run()
#16 {main}

Exception caught inside exception handler: exception 'DBUnexpectedError' with message 'Error in fetchRow(): WSREP has not yet prepared node for application use (192.168.42.42:3307)' in /var/www/ISWiki/prod/releases/20200129140901/lib/includes/db/DatabaseMysql.php:216
Stack trace:
#0 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/interwiki/Interwiki.php(168): DatabaseMysql->fetchRow(false)
#1 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/interwiki/Interwiki.php(60): Interwiki::load('webinar_series')
#2 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/interwiki/Interwiki.php(37): Interwiki::fetch('Webinar_Series')
#3 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/Title.php(2973): Interwiki::isValidInterwiki('Webinar_Series')
#4 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/Title.php(149): Title->secureAndSplit()
#5 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/parser/Parser.php(1841): Title::newFromText('Webinar_Series:...')
#6 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/parser/Parser.php(1680): Parser->replaceInternalLinks2('<div class="mw-...')
#7 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/parser/Parser.php(1120): Parser->replaceInternalLinks('<div class="mw-...')
#8 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/parser/Parser.php(345): Parser->internalParse('<div class="mw-...')
#9 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/OutputPage.php(1589): Parser->parse('<div class="mw-...', Object(Title), Object(ParserOptions), true, true, NULL)
#10 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/Skin.php(1421): OutputPage->parse('<div class="mw-...')
#11 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/Skin.php(1467): Skin->getCachedNotice('sitenotice')
#12 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/SkinTemplate.php(400): Skin->getSiteNotice()
#13 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/OutputPage.php(1982): SkinTemplate->outputPage()
#14 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/Exception.php(182): OutputPage->output()
#15 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/Exception.php(209): MWException->reportHTML()
#16 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/Exception.php(490): MWException->report()
#17 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/Exception.php(569): MWExceptionHandler::report(Object(DBQueryError))
#18 /var/www/ISWiki/prod/releases/20200129140901/lib/includes/Wiki.php(506): MWExceptionHandler::handle(Object(DBQueryError))
#19 /var/www/ISWiki/prod/releases/20200129140901/lib/index.php(58): MediaWiki->run()
#20 {main}