Fatal error: Uncaught Error: Class "MediaWiki\Api\ApiQueryBase" not found in /usr/www/otte/public/sphunt1/extensions/Echo/includes/Api/ApiEchoUnreadNotificationPages.php:21 Stack trace: #0 {main} thrown in /usr/www/otte/public/sphunt1/extensions/Echo/includes/Api/ApiEchoUnreadNotificationPages.php on line 21