Try waiting a few minutes and reloading.
(Cannot access the database)
Backtrace:
#0 /home/erf-wiki/webroot/includes/libs/rdbms/loadbalancer/LoadBalancer.php(768): Wikimedia\Rdbms\LoadBalancer->reportConnectionError() #1 /home/erf-wiki/webroot/includes/page/WikiPage.php(476): Wikimedia\Rdbms\LoadBalancer->getConnection(0) #2 /home/erf-wiki/webroot/includes/page/WikiPage.php(589): WikiPage->loadPageData() #3 /home/erf-wiki/webroot/includes/page/WikiPage.php(630): WikiPage->exists() #4 /home/erf-wiki/webroot/includes/page/WikiPage.php(268): WikiPage->getContentModel() #5 /home/erf-wiki/webroot/includes/page/WikiPage.php(255): WikiPage->getContentHandler() #6 /home/erf-wiki/webroot/includes/actions/Action.php(98): WikiPage->getActionOverrides() #7 /home/erf-wiki/webroot/includes/actions/Action.php(156): Action::factory('edit', Object(WikiPage), Object(RequestContext)) #8 /home/erf-wiki/webroot/includes/MediaWiki.php(155): Action::getActionName(Object(RequestContext)) #9 /home/erf-wiki/webroot/includes/MediaWiki.php(785): MediaWiki->getAction() #10 /home/erf-wiki/webroot/includes/MediaWiki.php(525): MediaWiki->main() #11 /home/erf-wiki/webroot/index.php(42): MediaWiki->run() #12 {main}