Fatal error: Uncaught Error: Class "OCP\AppFramework\Db\QBMapper" not found in /home/tzuovhm/tzuovhm/apps_/user_status/lib/Db/UserStatusMapper.php:20 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps_/user_status/lib/Db/UserStatusMapper.php on line 20