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Backtrace:

#0 /mnt/content/wiki/html/includes/libs/rdbms/loadbalancer/LoadBalancer.php(934): Wikimedia\Rdbms\LoadBalancer->reportConnectionError()
#1 /mnt/content/wiki/html/includes/libs/rdbms/loadbalancer/LoadBalancer.php(901): Wikimedia\Rdbms\LoadBalancer->getServerConnection()
#2 /mnt/content/wiki/html/includes/libs/rdbms/loadbalancer/LoadBalancer.php(1046): Wikimedia\Rdbms\LoadBalancer->getConnection()
#3 /mnt/content/wiki/html/includes/GlobalFunctions.php(2469): Wikimedia\Rdbms\LoadBalancer->getMaintenanceConnectionRef()
#4 /mnt/content/wiki/html/includes/cache/localisation/LCStoreDB.php(56): wfGetDB()
#5 /mnt/content/wiki/html/includes/cache/localisation/LocalisationCache.php(449): LCStoreDB->get()
#6 /mnt/content/wiki/html/includes/cache/localisation/LocalisationCache.php(495): LocalisationCache->isExpired()
#7 /mnt/content/wiki/html/includes/cache/localisation/LocalisationCache.php(371): LocalisationCache->initLanguage()
#8 /mnt/content/wiki/html/includes/cache/localisation/LocalisationCache.php(312): LocalisationCache->loadItem()
#9 /mnt/content/wiki/html/includes/language/LanguageFallback.php(106): LocalisationCache->getItem()
#10 /mnt/content/wiki/html/includes/language/LanguageFactory.php(175): MediaWiki\Languages\LanguageFallback->getAll()
#11 /mnt/content/wiki/html/includes/language/LanguageFactory.php(121): MediaWiki\Languages\LanguageFactory->newFromCode()
#12 /mnt/content/wiki/html/includes/ServiceWiring.php(242): MediaWiki\Languages\LanguageFactory->getLanguage()
#13 /mnt/content/wiki/html/vendor/wikimedia/services/src/ServiceContainer.php(447): Wikimedia\Services\ServiceContainer->{closure}()
#14 /mnt/content/wiki/html/vendor/wikimedia/services/src/ServiceContainer.php(416): Wikimedia\Services\ServiceContainer->createService()
#15 /mnt/content/wiki/html/includes/MediaWikiServices.php(623): Wikimedia\Services\ServiceContainer->getService()
#16 /mnt/content/wiki/html/includes/Setup.php(701): MediaWiki\MediaWikiServices->getContentLanguage()
#17 /mnt/content/wiki/html/includes/WebStart.php(89): require_once('/mnt/content/wi...')
#18 /mnt/content/wiki/html/index.php(44): require('/mnt/content/wi...')
#19 {main}