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 page_id,page_namespace,page_title,page_len,page_is_redirect,page_latest,pp_value FROM `page` LEFT JOIN `page_props` ON (pp_propname = 'hiddencat' AND (pp_page = page_id)) WHERE (page_namespace = '14' AND page_title IN ('Cooking_Energy_Compendium_(GIZ_HERA)','Cooking_Energy','Lessons_Learned','Charcoal','Impacts_Social','Impacts_Environmental','Impacts_Economic','Impacts','Wood_Energy') )
Function: OutputPage::addCategoryLinks
Error: 1047 WSREP has not yet prepared node for application use (192.168.42.42:3307)
' in /var/www/ISWiki/prod/releases/20200221115006/lib/includes/db/Database.php:918
Stack trace:
#0 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/db/Database.php(885): DatabaseBase->reportQueryError('WSREP has not y...', 1047, 'SELECT page_id...', 'OutputPage::add...', false)
#1 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/db/Database.php(1358): DatabaseBase->query('SELECT page_id...', 'OutputPage::add...')
#2 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/OutputPage.php(1129): DatabaseBase->select(Array, Array, '(page_namespace...', 'OutputPage::add...', Array, Array)
#3 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/OutputPage.php(1493): OutputPage->addCategoryLinks(Array)
#4 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/OutputPage.php(1539): OutputPage->addParserOutputNoText(Object(ParserOutput))
#5 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/diff/DifferenceEngine.php(527): OutputPage->addParserOutput(Object(ParserOutput))
#6 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/diff/DifferenceEngine.php(387): DifferenceEngine->renderNewRevision()
#7 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/Article.php(682): DifferenceEngine->showDiffPage(false)
#8 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/Article.php(434): Article->showDiffPage()
#9 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/actions/ViewAction.php(40): Article->view()
#10 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/Wiki.php(484): ViewAction->show()
#11 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/Wiki.php(278): MediaWiki->performAction(Object(Article))
#12 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/Wiki.php(593): MediaWiki->performRequest()
#13 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/Wiki.php(503): MediaWiki->main()
#14 /var/www/ISWiki/prod/releases/20200221115006/lib/index.php(58): MediaWiki->run()
#15 {main}

Exception caught inside exception handler: exception 'DBUnexpectedError' with message 'Error in numRows(): WSREP has not yet prepared node for application use (192.168.42.42:3307)' in /var/www/ISWiki/prod/releases/20200221115006/lib/includes/db/DatabaseMysql.php:234
Stack trace:
#0 /var/www/ISWiki/prod/releases/20200221115006/lib/extensions/SemanticForms/includes/SF_Utils.php(124): DatabaseMysql->numRows(false)
#1 /var/www/ISWiki/prod/releases/20200221115006/lib/extensions/SemanticForms/includes/SF_FormLinker.php(313): SFUtils::getCategoriesForPage(Object(Title))
#2 /var/www/ISWiki/prod/releases/20200221115006/lib/extensions/SemanticForms/includes/SF_FormEditAction.php(64): SFFormLinker::getDefaultFormsForPage(Object(Title))
#3 /var/www/ISWiki/prod/releases/20200221115006/lib/extensions/SemanticForms/includes/SF_FormEditAction.php(151): SFFormEditAction::displayTab(Object(SkinIswiki), Array)
#4 [internal function]: SFFormEditAction::displayTab2(Object(SkinIswiki), Array)
#5 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/Hooks.php(216): call_user_func_array('SFFormEditActio...', Array)
#6 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/GlobalFunctions.php(3859): Hooks::run('SkinTemplateNav...', Array)
#7 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/SkinTemplate.php(981): wfRunHooks('SkinTemplateNav...', Array)
#8 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/SkinTemplate.php(455): SkinTemplate->buildContentNavigationUrls()
#9 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/OutputPage.php(1982): SkinTemplate->outputPage()
#10 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/Exception.php(182): OutputPage->output()
#11 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/Exception.php(209): MWException->reportHTML()
#12 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/Exception.php(490): MWException->report()
#13 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/Exception.php(569): MWExceptionHandler::report(Object(DBQueryError))
#14 /var/www/ISWiki/prod/releases/20200221115006/lib/includes/Wiki.php(506): MWExceptionHandler::handle(Object(DBQueryError))
#15 /var/www/ISWiki/prod/releases/20200221115006/lib/index.php(58): MediaWiki->run()
#16 {main}