Fatal error: Uncaught Error: Class "OCP\Migration\SimpleMigrationStep" not found in /home/tzuovhm/tzuovhm/apps/dav/lib/Migration/Version1005Date20180530124431.php:13 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps/dav/lib/Migration/Version1005Date20180530124431.php on line 13