Fatal error: Uncaught Error: Class "MediaWiki\Api\ApiBase" not found in /var/www/html/w/extensions/SemanticMediaWiki/src/MediaWiki/Api/Task.php:17 Stack trace: #0 {main} thrown in /var/www/html/w/extensions/SemanticMediaWiki/src/MediaWiki/Api/Task.php on line 17