Fatal error: Uncaught Error: Class "MediaWiki\Api\ApiBase" not found in /usr/www/otte/public/sphunt1/extensions/Echo/includes/Api/ApiEchoMarkSeen.php:11 Stack trace: #0 {main} thrown in /usr/www/otte/public/sphunt1/extensions/Echo/includes/Api/ApiEchoMarkSeen.php on line 11