Fatal error: Uncaught Error: Class "OCP\AppFramework\Controller" not found in /home/tzuovhm/tzuovhm/apps_/files_external/lib/Controller/AjaxController.php:19 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps_/files_external/lib/Controller/AjaxController.php on line 19