Fatal error: Uncaught Error: Class "OCP\Migration\SimpleMigrationStep" not found in /home/tzuovhm/tzuovhm/apps/dav/lib/Migration/Version1006Date20180619154313.php:16 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps/dav/lib/Migration/Version1006Date20180619154313.php on line 16