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(Cannot access the database: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111) (localhost))

Backtrace:

#0 /var/www/mediawiki-1.28.0/includes/libs/rdbms/loadbalancer/LoadBalancer.php(897): Database->reportConnectionError('Unknown error (...')
#1 /var/www/mediawiki-1.28.0/includes/libs/rdbms/loadbalancer/LoadBalancer.php(572): LoadBalancer->reportConnectionError()
#2 /var/www/mediawiki-1.28.0/includes/GlobalFunctions.php(3075): LoadBalancer->getConnection(-1, Array, false)
#3 /var/www/mediawiki-1.28.0/includes/cache/MessageCache.php(444): wfGetDB(-1)
#4 /var/www/mediawiki-1.28.0/includes/cache/MessageCache.php(403): MessageCache->loadFromDB('en', NULL)
#5 /var/www/mediawiki-1.28.0/includes/cache/MessageCache.php(325): MessageCache->loadFromDBWithLock('en', Array, NULL)
#6 /var/www/mediawiki-1.28.0/includes/cache/MessageCache.php(927): MessageCache->load('en')
#7 /var/www/mediawiki-1.28.0/includes/cache/MessageCache.php(858): MessageCache->getMsgFromNamespace('Specialpages', 'en')
#8 /var/www/mediawiki-1.28.0/includes/cache/MessageCache.php(826): MessageCache->getMessageForLang(Object(Language), 'specialpages', true, Array)
#9 /var/www/mediawiki-1.28.0/includes/cache/MessageCache.php(767): MessageCache->getMessageFromFallbackChain(Object(Language), 'specialpages', true)
#10 /var/www/mediawiki-1.28.0/includes/Message.php(1188): MessageCache->get('specialpages', true, Object(Language))
#11 /var/www/mediawiki-1.28.0/includes/Message.php(802): Message->fetchMessage()
#12 /var/www/mediawiki-1.28.0/includes/Message.php(902): Message->toString()
#13 /var/www/mediawiki-1.28.0/includes/specialpage/SpecialPage.php(607): Message->text()
#14 /var/www/mediawiki-1.28.0/includes/specialpage/SpecialPage.php(488): SpecialPage->getDescription()
#15 /var/www/mediawiki-1.28.0/includes/specials/SpecialSpecialpages.php(37): SpecialPage->setHeaders()
#16 /var/www/mediawiki-1.28.0/includes/specialpage/SpecialPage.php(522): SpecialSpecialpages->execute(NULL)
#17 /var/www/mediawiki-1.28.0/includes/specialpage/SpecialPageFactory.php(576): SpecialPage->run(NULL)
#18 /var/www/mediawiki-1.28.0/includes/MediaWiki.php(283): SpecialPageFactory::executePath(Object(Title), Object(RequestContext))
#19 /var/www/mediawiki-1.28.0/includes/MediaWiki.php(851): MediaWiki->performRequest()
#20 /var/www/mediawiki-1.28.0/includes/MediaWiki.php(512): MediaWiki->main()
#21 /var/www/mediawiki-1.28.0/index.php(43): MediaWiki->run()
#22 {main}

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