Fatal error: Uncaught Error: Interface 'OCP\Notification\INotifier' not found in /home/mattiapa/cloud2.mprnl.fr/owncloud/apps/customgroups/lib/Notifier.php:30 Stack trace: #0 {main} thrown in /home/mattiapa/cloud2.mprnl.fr/owncloud/apps/customgroups/lib/Notifier.php on line 30