Fatal error: Uncaught Error: Interface 'OCP\GroupInterface' not found in /home/mattiapa/cloud2.mprnl.fr/owncloud/apps/customgroups/lib/CustomGroupsBackend.php:27 Stack trace: #0 {main} thrown in /home/mattiapa/cloud2.mprnl.fr/owncloud/apps/customgroups/lib/CustomGroupsBackend.php on line 27