Fatal error: Uncaught Error: Class "OCP\Migration\SimpleMigrationStep" not found in /home/tzuovhm/tzuovhm/apps/files/lib/Migration/Version11301Date20191205150729.php:16 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps/files/lib/Migration/Version11301Date20191205150729.php on line 16