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Backtrace:

#0 /var/www/mediawiki-1.39.5/w/includes/libs/rdbms/loadbalancer/LoadBalancer.php(972): Wikimedia\Rdbms\LoadBalancer->reportConnectionError()
#1 /var/www/mediawiki-1.39.5/w/includes/libs/rdbms/loadbalancer/LoadBalancer.php(944): Wikimedia\Rdbms\LoadBalancer->getServerConnection()
#2 /var/www/mediawiki-1.39.5/w/includes/libs/rdbms/database/DBConnRef.php(95): Wikimedia\Rdbms\LoadBalancer->getConnectionInternal()
#3 /var/www/mediawiki-1.39.5/w/includes/libs/rdbms/database/DBConnRef.php(101): Wikimedia\Rdbms\DBConnRef->ensureConnection()
#4 /var/www/mediawiki-1.39.5/w/includes/libs/rdbms/database/DBConnRef.php(516): Wikimedia\Rdbms\DBConnRef->__call()
#5 /var/www/mediawiki-1.39.5/w/includes/language/MessageCache.php(574): Wikimedia\Rdbms\DBConnRef->anyString()
#6 /var/www/mediawiki-1.39.5/w/includes/language/MessageCache.php(481): MessageCache->loadFromDB()
#7 /var/www/mediawiki-1.39.5/w/includes/language/MessageCache.php(398): MessageCache->loadFromDBWithMainLock()
#8 /var/www/mediawiki-1.39.5/w/includes/language/MessageCache.php(318): MessageCache->loadUnguarded()
#9 /var/www/mediawiki-1.39.5/w/includes/language/MessageCache.php(1199): MessageCache->load()
#10 /var/www/mediawiki-1.39.5/w/includes/language/MessageCache.php(1126): MessageCache->getMsgFromNamespace()
#11 /var/www/mediawiki-1.39.5/w/includes/language/MessageCache.php(1097): MessageCache->getMessageForLang()
#12 /var/www/mediawiki-1.39.5/w/includes/language/MessageCache.php(1039): MessageCache->getMessageFromFallbackChain()
#13 /var/www/mediawiki-1.39.5/w/includes/language/Message.php(1473): MessageCache->get()
#14 /var/www/mediawiki-1.39.5/w/includes/language/Message.php(970): Message->fetchMessage()
#15 /var/www/mediawiki-1.39.5/w/includes/language/Message.php(1053): Message->format()
#16 /var/www/mediawiki-1.39.5/w/includes/Title.php(715): Message->text()
#17 /var/www/mediawiki-1.39.5/w/includes/MediaWiki.php(142): Title::newMainPage()
#18 /var/www/mediawiki-1.39.5/w/includes/MediaWiki.php(162): MediaWiki->parseTitle()
#19 /var/www/mediawiki-1.39.5/w/includes/MediaWiki.php(860): MediaWiki->getTitle()
#20 /var/www/mediawiki-1.39.5/w/includes/MediaWiki.php(562): MediaWiki->main()
#21 /var/www/mediawiki-1.39.5/w/index.php(50): MediaWiki->run()
#22 /var/www/mediawiki-1.39.5/w/index.php(46): wfIndexMain()
#23 /var/www/mediawiki-1.35.13/x/index.php(21): require_once('/var/www/mediaw...')
#24 {main}