Fatal error: Uncaught Error: Class 'MediaWiki\HeaderCallback' not found in /home/animelon/public_html/wiki/includes/Setup.php:108 Stack trace: #0 /home/animelon/public_html/wiki/includes/WebStart.php(81): require_once() #1 /home/animelon/public_html/wiki/index.php(41): require('/home/animelon/...') #2 {main} thrown in /home/animelon/public_html/wiki/includes/Setup.php on line 108