Fatal error: Uncaught Error: Interface 'Sabre\DAV\IExtendedCollection' not found in /home/mattiapa/cloud2.mprnl.fr/owncloud/apps/customgroups/lib/Dav/GroupsCollection.php:42 Stack trace: #0 {main} thrown in /home/mattiapa/cloud2.mprnl.fr/owncloud/apps/customgroups/lib/Dav/GroupsCollection.php on line 42