Fatal error: Uncaught Error: Class "MediaWiki\Content\JsonContentHandler" not found in /home/floten1/q.tenbergen.ca/extensions/Gadgets/includes/Content/GadgetDefinitionContentHandler.php:35 Stack trace: #0 {main} thrown in /home/floten1/q.tenbergen.ca/extensions/Gadgets/includes/Content/GadgetDefinitionContentHandler.php on line 35