Fatal error: Uncaught Error: Class "OCP\AppFramework\Db\QBMapper" not found in /var/www/html/nextcloud/apps/files_downloadlimit/lib/Db/LimitMapper.php:15 Stack trace: #0 {main} thrown in /var/www/html/nextcloud/apps/files_downloadlimit/lib/Db/LimitMapper.php on line 15