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Backtrace:

#0 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/libs/rdbms/loadbalancer/LoadBalancer.php(991): Wikimedia\Rdbms\LoadBalancer->reportConnectionError()
#1 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/libs/rdbms/loadbalancer/LoadBalancer.php(963): Wikimedia\Rdbms\LoadBalancer->getServerConnection()
#2 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/libs/rdbms/loadbalancer/LoadBalancer.php(1128): Wikimedia\Rdbms\LoadBalancer->getConnection()
#3 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/GlobalFunctions.php(2229): Wikimedia\Rdbms\LoadBalancer->getMaintenanceConnectionRef()
#4 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/extensions/Gadgets/includes/MediaWikiGadgetsDefinitionRepo.php(109): wfGetDB()
#5 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/libs/objectcache/wancache/WANObjectCache.php(1700): MediaWikiGadgetsDefinitionRepo->{closure}()
#6 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/libs/objectcache/wancache/WANObjectCache.php(1532): WANObjectCache->fetchOrRegenerate()
#7 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/extensions/Gadgets/includes/MediaWikiGadgetsDefinitionRepo.php(119): WANObjectCache->getWithSetCallback()
#8 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/extensions/Gadgets/includes/MediaWikiGadgetsDefinitionRepo.php(33): MediaWikiGadgetsDefinitionRepo->loadGadgets()
#9 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/extensions/Gadgets/includes/GadgetRepo.php(71): MediaWikiGadgetsDefinitionRepo->getGadgetIds()
#10 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/extensions/Gadgets/includes/GadgetHooks.php(68): GadgetRepo->getStructuredList()
#11 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/HookContainer/HookContainer.php(338): GadgetHooks::userGetDefaultOptions()
#12 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/HookContainer/HookContainer.php(137): MediaWiki\HookContainer\HookContainer->callLegacyHook()
#13 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/HookContainer/HookRunner.php(4102): MediaWiki\HookContainer\HookContainer->run()
#14 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/user/DefaultOptionsLookup.php(102): MediaWiki\HookContainer\HookRunner->onUserGetDefaultOptions()
#15 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/user/UserOptionsManager.php(592): MediaWiki\User\DefaultOptionsLookup->getDefaultOptions()
#16 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/user/UserOptionsManager.php(494): MediaWiki\User\UserOptionsManager->loadOriginalOptions()
#17 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/user/UserOptionsManager.php(141): MediaWiki\User\UserOptionsManager->loadUserOptions()
#18 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/user/User.php(2561): MediaWiki\User\UserOptionsManager->getOption()
#19 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/context/RequestContext.php(384): User->getOption()
#20 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/language/Message.php(765): RequestContext->getLanguage()
#21 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/context/RequestContext.php(476): Message->setContext()
#22 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/specialpage/SpecialPage.php(913): RequestContext->msg()
#23 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/specialpage/SpecialPage.php(734): SpecialPage->msg()
#24 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/specialpage/SpecialPage.php(622): SpecialPage->getDescription()
#25 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/specials/SpecialWhatLinksHere.php(87): SpecialPage->setHeaders()
#26 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/specialpage/SpecialPage.php(647): SpecialWhatLinksHere->execute()
#27 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/specialpage/SpecialPageFactory.php(1366): SpecialPage->run()
#28 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/MediaWiki.php(314): MediaWiki\SpecialPage\SpecialPageFactory->executePath()
#29 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/MediaWiki.php(932): MediaWiki->performRequest()
#30 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/MediaWiki.php(563): MediaWiki->main()
#31 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/index.php(53): MediaWiki->run()
#32 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/index.php(46): wfIndexMain()
#33 {main}