Fatal error: Uncaught Error: Class "OCP\Migration\SimpleMigrationStep" not found in /home/tzuovhm/tzuovhm/apps_/spreed/lib/Migration/Version2001Date20170921145301.php:15 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps_/spreed/lib/Migration/Version2001Date20170921145301.php on line 15