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(Cannot access the database)

Backtrace:

#0 /usr/share/mediawiki/includes/libs/rdbms/loadbalancer/LoadBalancer.php(972): Wikimedia\Rdbms\LoadBalancer->reportConnectionError()
#1 /usr/share/mediawiki/includes/libs/rdbms/loadbalancer/LoadBalancer.php(944): Wikimedia\Rdbms\LoadBalancer->getServerConnection()
#2 /usr/share/mediawiki/includes/libs/rdbms/database/DBConnRef.php(95): Wikimedia\Rdbms\LoadBalancer->getConnectionInternal()
#3 /usr/share/mediawiki/includes/libs/rdbms/database/DBConnRef.php(101): Wikimedia\Rdbms\DBConnRef->ensureConnection()
#4 /usr/share/mediawiki/includes/libs/rdbms/database/DBConnRef.php(313): Wikimedia\Rdbms\DBConnRef->__call()
#5 /usr/share/mediawiki/includes/language/LCStoreDB.php(61): Wikimedia\Rdbms\DBConnRef->selectField()
#6 /usr/share/mediawiki/includes/language/LocalisationCache.php(451): LCStoreDB->get()
#7 /usr/share/mediawiki/includes/language/LocalisationCache.php(497): LocalisationCache->isExpired()
#8 /usr/share/mediawiki/includes/language/LocalisationCache.php(373): LocalisationCache->initLanguage()
#9 /usr/share/mediawiki/includes/language/LocalisationCache.php(314): LocalisationCache->loadItem()
#10 /usr/share/mediawiki/includes/language/Language.php(492): LocalisationCache->getItem()
#11 /usr/share/mediawiki/includes/language/Language.php(713): Language->getNamespaces()
#12 /usr/share/mediawiki/includes/language/Language.php(736): Language->getNamespaceIds()
#13 /usr/share/mediawiki/includes/title/MediaWikiTitleCodec.php(415): Language->getNsIndex()
#14 /usr/share/mediawiki/includes/Title.php(2982): MediaWikiTitleCodec->splitTitleString()
#15 /usr/share/mediawiki/includes/Title.php(480): Title->secureAndSplit()
#16 /usr/share/mediawiki/includes/MediaWiki.php(89): Title::newFromURL()
#17 /usr/share/mediawiki/includes/MediaWiki.php(162): MediaWiki->parseTitle()
#18 /usr/share/mediawiki/includes/MediaWiki.php(860): MediaWiki->getTitle()
#19 /usr/share/mediawiki/includes/MediaWiki.php(562): MediaWiki->main()
#20 /usr/share/mediawiki/index.php(50): MediaWiki->run()
#21 /usr/share/mediawiki/index.php(46): wfIndexMain()
#22 {main}