Fatal error: Uncaught Error: Class "OCP\AppFramework\Db\QBMapper" not found in /var/www/html/nextcloud/apps/app_api/lib/Db/UI/StyleMapper.php:22 Stack trace: #0 {main} thrown in /var/www/html/nextcloud/apps/app_api/lib/Db/UI/StyleMapper.php on line 22