Fatal error: Uncaught Error: Class "OCP\AppFramework\Controller" not found in /home/tzuovhm/tzuovhm/apps/activity/lib/Controller/ActivitiesController.php:23 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps/activity/lib/Controller/ActivitiesController.php on line 23