Fatal error: Uncaught Error: Class "OCP\Migration\SimpleMigrationStep" not found in /home/tzuovhm/tzuovhm/apps/dav/lib/Migration/Version1004Date20170924124212.php:12 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps/dav/lib/Migration/Version1004Date20170924124212.php on line 12