Fatal error: Uncaught Error: Class "OCP\AppFramework\Controller" not found in /home/tzuovhm/tzuovhm/apps_/mail/lib/Controller/SmimeCertificatesController.php:26 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps_/mail/lib/Controller/SmimeCertificatesController.php on line 26