FetchZone fails, but fetchzones works

Hello, this is my first day with XML API (and its wrapper). After authentication, i'm able to have my fetchzones: $result = $xmlapi->api2_query($my_user, "ZoneEdit", "fetchzones"); this one works... but for fetchzone: $result = $xmlapi->api2_query($my_user, "ZoneEdit", "fetchzone",array("","","mydomain.com")); i got error with this message inside it: "You do not have permission to read the zone for :" Any idea whats wrong ? do i miss something ? Thanks