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(Cannot access the database)

Backtrace:

#0 /var/www/html/wiki/includes/libs/rdbms/loadbalancer/LoadBalancer.php(769): Wikimedia\Rdbms\LoadBalancer->reportConnectionError()
#1 /var/www/html/wiki/includes/page/WikiPage.php(477): Wikimedia\Rdbms\LoadBalancer->getConnection(0)
#2 /var/www/html/wiki/includes/page/WikiPage.php(590): WikiPage->loadPageData()
#3 /var/www/html/wiki/includes/page/WikiPage.php(631): WikiPage->exists()
#4 /var/www/html/wiki/includes/page/WikiPage.php(269): WikiPage->getContentModel()
#5 /var/www/html/wiki/includes/page/WikiPage.php(256): WikiPage->getContentHandler()
#6 /var/www/html/wiki/includes/actions/Action.php(98): WikiPage->getActionOverrides()
#7 /var/www/html/wiki/includes/actions/Action.php(156): Action::factory('info', Object(WikiPage), Object(RequestContext))
#8 /var/www/html/wiki/includes/MediaWiki.php(155): Action::getActionName(Object(RequestContext))
#9 /var/www/html/wiki/includes/MediaWiki.php(777): MediaWiki->getAction()
#10 /var/www/html/wiki/includes/MediaWiki.php(517): MediaWiki->main()
#11 /var/www/html/wiki/index.php(42): MediaWiki->run()
#12 {main}

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