Fatal error: Uncaught Error: Class "SMW\MediaWiki\Deferred\CallableUpdate" not found in /var/www/html/extensions/SemanticMediaWiki/src/MediaWiki/Deferred/TransactionalCallableUpdate.php:19 Stack trace: #0 {main} thrown in /var/www/html/extensions/SemanticMediaWiki/src/MediaWiki/Deferred/TransactionalCallableUpdate.php on line 19