Fatal error: Uncaught Error: Class "OCP\AppFramework\Db\QBMapper" not found in /home/tzuovhm/tzuovhm/nextcloud/lib/private/Updater/ChangesMapper.php:19 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/nextcloud/lib/private/Updater/ChangesMapper.php on line 19