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Backtrace:

#0 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/libs/rdbms/loadbalancer/LoadBalancer.php(897): Database->reportConnectionError('Unknown error (...')
#1 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/libs/rdbms/loadbalancer/LoadBalancer.php(572): LoadBalancer->reportConnectionError()
#2 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/GlobalFunctions.php(3075): LoadBalancer->getConnection(-1, Array, false)
#3 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/cache/MessageCache.php(444): wfGetDB(-1)
#4 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/cache/MessageCache.php(403): MessageCache->loadFromDB('en', NULL)
#5 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/cache/MessageCache.php(325): MessageCache->loadFromDBWithLock('en', Array, NULL)
#6 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/cache/MessageCache.php(927): MessageCache->load('en')
#7 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/cache/MessageCache.php(858): MessageCache->getMsgFromNamespace('Gadgets-definit...', 'en')
#8 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/cache/MessageCache.php(826): MessageCache->getMessageForLang(Object(Language), 'gadgets-definit...', true, Array)
#9 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/cache/MessageCache.php(767): MessageCache->getMessageFromFallbackChain(Object(Language), 'gadgets-definit...', true)
#10 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/Message.php(1188): MessageCache->get('gadgets-definit...', true, Object(Language))
#11 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/Message.php(950): Message->fetchMessage()
#12 /var/www/html/mediawiki/mediawiki-1.28.0-orig/extensions/Gadgets/includes/MediaWikiGadgetsDefinitionRepo.php(113): Message->exists()
#13 /var/www/html/mediawiki/mediawiki-1.28.0-orig/extensions/Gadgets/includes/MediaWikiGadgetsDefinitionRepo.php(83): MediaWikiGadgetsDefinitionRepo->fetchStructuredList()
#14 [internal function]: MediaWikiGadgetsDefinitionRepo->{closure}(false, 86400, Array, NULL)
#15 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/libs/objectcache/WANObjectCache.php(1004): call_user_func_array(Object(Closure), Array)
#16 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/libs/objectcache/WANObjectCache.php(906): WANObjectCache->doGetWithSetCallback('bdmp_admin_wiki...', 86400, Object(Closure), Array)
#17 /var/www/html/mediawiki/mediawiki-1.28.0-orig/extensions/Gadgets/includes/MediaWikiGadgetsDefinitionRepo.php(91): WANObjectCache->getWithSetCallback('bdmp_admin_wiki...', 86400, Object(Closure), Array)
#18 /var/www/html/mediawiki/mediawiki-1.28.0-orig/extensions/Gadgets/includes/MediaWikiGadgetsDefinitionRepo.php(23): MediaWikiGadgetsDefinitionRepo->loadGadgets()
#19 /var/www/html/mediawiki/mediawiki-1.28.0-orig/extensions/Gadgets/includes/GadgetRepo.php(36): MediaWikiGadgetsDefinitionRepo->getGadgetIds()
#20 /var/www/html/mediawiki/mediawiki-1.28.0-orig/extensions/Gadgets/GadgetHooks.php(52): GadgetRepo->getStructuredList()
#21 [internal function]: GadgetHooks::userGetDefaultOptions(Array)
#22 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/Hooks.php(195): call_user_func_array('GadgetHooks::us...', Array)
#23 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/user/User.php.orig(1552): Hooks::run('UserGetDefaultO...', Array)
#24 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/user/User.php.orig(5131): User::getDefaultOptions()
#25 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/user/User.php.orig(2768): User->loadOptions()
#26 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/context/RequestContext.php(364): User->getOption('language')
#27 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/Message.php(364): RequestContext->getLanguage()
#28 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/Message.php(1188): Message->getLanguage()
#29 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/Message.php(962): Message->fetchMessage()
#30 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/user/User.php.orig(4696): Message->isBlank()
#31 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/user/User.php.orig(4803): User::getGroupName('user')
#32 [internal function]: User::makeGroupLinkWiki('user')
#33 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/Title.php(2422): array_map(Array, Array)
#34 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/Title.php(2400): Title->missingPermissionError('read', false)
#35 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/Title.php(2498): Title->checkReadPermissions('read', Object(User), Array, 'secure', false)
#36 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/Title.php(1924): Title->getUserPermissionsErrorsInternal('read', Object(User), 'secure')
#37 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/MediaWiki.php(202): Title->getUserPermissionsErrors('read', Object(User))
#38 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/MediaWiki.php(851): MediaWiki->performRequest()
#39 /var/www/html/mediawiki/mediawiki-1.28.0-orig/includes/MediaWiki.php(512): MediaWiki->main()
#40 /var/www/html/mediawiki/mediawiki-1.28.0-orig/index.php(43): MediaWiki->run()
#41 {main}

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