Fatal error: Uncaught Error: Class "MediaWiki\OutputTransform\ContentDOMTransformStage" not found in /var/www/html/w/includes/OutputTransform/Stages/ExpandRelativeAttrs.php:26 Stack trace: #0 {main} thrown in /var/www/html/w/includes/OutputTransform/Stages/ExpandRelativeAttrs.php on line 26