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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(1096): Wikimedia\Rdbms\LoadBalancer->getConnection()
#3 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/Permissions/RestrictionStore.php(643): Wikimedia\Rdbms\LoadBalancer->getConnectionRef()
#4 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/Permissions/RestrictionStore.php(593): MediaWiki\Permissions\RestrictionStore->getCascadeProtectionSourcesInternal()
#5 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/Title.php(2606): MediaWiki\Permissions\RestrictionStore->getCascadeProtectionSources()
#6 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/Permissions/PermissionManager.php(1017): Title->getCascadeProtectionSources()
#7 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/Permissions/PermissionManager.php(464): MediaWiki\Permissions\PermissionManager->checkCascadingSourcesRestrictions()
#8 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/Permissions/PermissionManager.php(311): MediaWiki\Permissions\PermissionManager->getPermissionErrorsInternal()
#9 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/Permissions/UserAuthority.php(259): MediaWiki\Permissions\PermissionManager->getPermissionErrors()
#10 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/Permissions/UserAuthority.php(231): MediaWiki\Permissions\UserAuthority->internalCan()
#11 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/user/User.php(4330): MediaWiki\Permissions\UserAuthority->authorizeWrite()
#12 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/auth/AuthManager.php(1090): User->authorizeWrite()
#13 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/specials/SpecialCreateAccount.php(61): MediaWiki\Auth\AuthManager->checkAccountCreatePermissions()
#14 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/specialpage/LoginSignupSpecialPage.php(238): SpecialCreateAccount->checkPermissions()
#15 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/specialpage/SpecialPage.php(647): LoginSignupSpecialPage->execute()
#16 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/specialpage/SpecialPageFactory.php(1366): SpecialPage->run()
#17 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/MediaWiki.php(314): MediaWiki\SpecialPage\SpecialPageFactory->executePath()
#18 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/MediaWiki.php(932): MediaWiki->performRequest()
#19 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/includes/MediaWiki.php(563): MediaWiki->main()
#20 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/index.php(53): MediaWiki->run()
#21 /web1-webroot1/wikiroot/mediawiki-1.37.4/w/index.php(46): wfIndexMain()
#22 {main}