App with BBI, crashes on watch but works in simulator

Hello,


i just started developing an app that uses the BBI data from the Forerunner 645M.

I try to implement simple sensor data reading and then display the BBI array on the screen.

It works in the simulator with simulated sensor data but when i try to run it on the watch the application instantly crashes.

Permissions are set for Sensor.


I started with the sample application and added these lines to the code. As soon as i use the Sensor.Toybox it crashes on the Watch:


using Toybox.Sensor;

class BBIApp extends Application.AppBase {



function initialize() {

AppBase.initialize();

var options = {

:heartBeatIntervals => {:enabled => true},

:period => 1

};

Sensor.registerSensorDataListener(method(:onSensorData), options);

}

function onSensorData(sensorData){

// Do something with the data

}


Any idea what to do?


Thanks in advice.