Fatal error: Uncaught Error: Interface 'OCP\Activity\IExtension' not found in /home/mattiapa/cloud2.mprnl.fr/owncloud/apps/announcementcenter/lib/Activity/Extension.php:29 Stack trace: #0 {main} thrown in /home/mattiapa/cloud2.mprnl.fr/owncloud/apps/announcementcenter/lib/Activity/Extension.php on line 29