Try waiting a few minutes and reloading.
(Cannot access the database)
Backtrace:
#0 /var/www/html/mediawiki-1.28.0/includes/libs/rdbms/loadbalancer/LoadBalancer.php(897): Database->reportConnectionError('Too many connec...') #1 /var/www/html/mediawiki-1.28.0/includes/libs/rdbms/loadbalancer/LoadBalancer.php(572): LoadBalancer->reportConnectionError() #2 /var/www/html/mediawiki-1.28.0/includes/GlobalFunctions.php(3075): LoadBalancer->getConnection(0, Array, false) #3 /var/www/html/mediawiki-1.28.0/includes/cache/LinkCache.php(267): wfGetDB(-1) #4 /var/www/html/mediawiki-1.28.0/includes/Title.php(3184): LinkCache->addLinkObj(Object(Title)) #5 /var/www/html/mediawiki-1.28.0/includes/Title.php(3201): Title->getArticleID(0) #6 /var/www/html/mediawiki-1.28.0/includes/OutputPage.php(1007): Title->isRedirect() #7 /var/www/html/mediawiki-1.28.0/includes/OutputPage.php(1021): OutputPage::buildBacklinkSubtitle(Object(Title), Array) #8 /var/www/html/mediawiki-1.28.0/includes/specials/SpecialWhatlinkshere.php(89): OutputPage->addBacklinkSubtitle(Object(Title)) #9 /var/www/html/mediawiki-1.28.0/includes/specialpage/SpecialPage.php(522): SpecialWhatLinksHere->execute('Verhoogen_(Boga...') #10 /var/www/html/mediawiki-1.28.0/includes/specialpage/SpecialPageFactory.php(576): SpecialPage->run('Verhoogen_(Boga...') #11 /var/www/html/mediawiki-1.28.0/includes/MediaWiki.php(283): SpecialPageFactory::executePath(Object(Title), Object(RequestContext)) #12 /var/www/html/mediawiki-1.28.0/includes/MediaWiki.php(851): MediaWiki->performRequest() #13 /var/www/html/mediawiki-1.28.0/includes/MediaWiki.php(512): MediaWiki->main() #14 /var/www/html/mediawiki-1.28.0/index.php(43): MediaWiki->run() #15 {main}