Try waiting a few minutes and reloading.
(Cannot access the database)
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}