Fatal error: Uncaught Error: Class "SpecialPage" not found in /var/www/html/extensions/SemanticMediaWiki/src/MediaWiki/Specials/SpecialAdmin.php:30 Stack trace: #0 {main} thrown in /var/www/html/extensions/SemanticMediaWiki/src/MediaWiki/Specials/SpecialAdmin.php on line 30