Fatal error: Uncaught Error: Class "MediaWiki\Api\ApiBase" not found in /home/floten1/q.tenbergen.ca/extensions/Echo/includes/Api/ApiEchoMarkSeen.php:11 Stack trace: #0 {main} thrown in /home/floten1/q.tenbergen.ca/extensions/Echo/includes/Api/ApiEchoMarkSeen.php on line 11