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(Cannot access the database)

Backtrace:

#0 /var/lib/mediawiki-1.29.1/includes/libs/rdbms/loadbalancer/LoadBalancer.php(995): Wikimedia\Rdbms\Database->reportConnectionError('No such file or...')
#1 /var/lib/mediawiki-1.29.1/includes/libs/rdbms/loadbalancer/LoadBalancer.php(666): Wikimedia\Rdbms\LoadBalancer->reportConnectionError()
#2 /var/lib/mediawiki-1.29.1/includes/GlobalFunctions.php(3064): Wikimedia\Rdbms\LoadBalancer->getConnection(0, Array, false)
#3 /var/lib/mediawiki-1.29.1/includes/page/WikiPage.php(384): wfGetDB(-1)
#4 /var/lib/mediawiki-1.29.1/includes/page/WikiPage.php(467): WikiPage->loadPageData()
#5 /var/lib/mediawiki-1.29.1/includes/page/WikiPage.php(508): WikiPage->exists()
#6 /var/lib/mediawiki-1.29.1/includes/page/WikiPage.php(230): WikiPage->getContentModel()
#7 /var/lib/mediawiki-1.29.1/includes/page/WikiPage.php(217): WikiPage->getContentHandler()
#8 /var/lib/mediawiki-1.29.1/includes/actions/Action.php(96): WikiPage->getActionOverrides()
#9 /var/lib/mediawiki-1.29.1/includes/actions/Action.php(154): Action::factory('edit', Object(WikiPage), Object(RequestContext))
#10 /var/lib/mediawiki-1.29.1/includes/MediaWiki.php(155): Action::getActionName(Object(RequestContext))
#11 /var/lib/mediawiki-1.29.1/includes/MediaWiki.php(779): MediaWiki->getAction()
#12 /var/lib/mediawiki-1.29.1/includes/MediaWiki.php(523): MediaWiki->main()
#13 /var/lib/mediawiki-1.29.1/index.php(43): MediaWiki->run()
#14 {main}

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