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Backtrace:

#0 /var/www/html/includes/libs/rdbms/loadbalancer/LoadBalancer.php(956): Wikimedia\Rdbms\LoadBalancer->reportConnectionError()
#1 /var/www/html/includes/libs/rdbms/loadbalancer/LoadBalancer.php(928): Wikimedia\Rdbms\LoadBalancer->getServerConnection()
#2 /var/www/html/includes/libs/rdbms/loadbalancer/LoadBalancer.php(1086): Wikimedia\Rdbms\LoadBalancer->getConnection()
#3 /var/www/html/includes/GlobalFunctions.php(2208): Wikimedia\Rdbms\LoadBalancer->getMaintenanceConnectionRef()
#4 /var/www/html/includes/cache/localisation/LCStoreDB.php(57): wfGetDB()
#5 /var/www/html/includes/cache/localisation/LocalisationCache.php(448): LCStoreDB->get()
#6 /var/www/html/includes/cache/localisation/LocalisationCache.php(494): LocalisationCache->isExpired()
#7 /var/www/html/includes/cache/localisation/LocalisationCache.php(413): LocalisationCache->initLanguage()
#8 /var/www/html/includes/cache/localisation/LocalisationCache.php(332): LocalisationCache->loadSubitem()
#9 /var/www/html/includes/language/Language.php(2607): LocalisationCache->getSubitem()
#10 /var/www/html/includes/cache/MessageCache.php(1053): Language->getMessage()
#11 /var/www/html/includes/cache/MessageCache.php(1011): MessageCache->getMessageForLang()
#12 /var/www/html/includes/cache/MessageCache.php(953): MessageCache->getMessageFromFallbackChain()
#13 /var/www/html/includes/language/Message.php(1491): MessageCache->get()
#14 /var/www/html/includes/language/Message.php(968): Message->fetchMessage()
#15 /var/www/html/includes/language/Message.php(1071): Message->format()
#16 /var/www/html/includes/api/ApiErrorFormatter_BackCompat.php(90): Message->text()
#17 /var/www/html/includes/api/ApiErrorFormatter.php(175): ApiErrorFormatter_BackCompat->addWarningOrError()
#18 /var/www/html/includes/api/ApiMain.php(1366): ApiErrorFormatter->addError()
#19 /var/www/html/includes/api/ApiMain.php(932): ApiMain->substituteResultWithError()
#20 /var/www/html/includes/api/ApiMain.php(877): ApiMain->handleException()
#21 /var/www/html/includes/api/ApiMain.php(841): ApiMain->executeActionWithErrorHandling()
#22 /var/www/html/api.php(90): ApiMain->execute()
#23 /var/www/html/api.php(45): wfApiMain()
#24 {main}