UserProfile Error

Hi,


What's wrong in this simple Datafield for 920?


//************************************** SIMPLE DATAFIELD CODE TO ACCESS USER PROFILE 920XT *****************************
using Toybox.WatchUi as Ui;
using Toybox.UserProfile as UserProfile;

class UserDataView extends Ui.SimpleDataField {

function initialize() {
label = "My Label";
}

function compute(info) {

var h = UserProfile.getProfile().height.toNumber();
var w = UserProfile.getProfile().weight.toNumber();

return h*w;
}

}

CONSOLE RESULT

Connecting to device...
Device Version 0.1.0
Device id 1 name "A garmin device"
Shell Version 0.1.0
Permission required
Permission Required
@PC = 0x10000018
Failed invoking <symbol>
Permission Required
Permission Required
Permission Required


Thanks.