Heart rate data for Venu 2 Plus

Hi, I am attempting to monitor the heart rate on my Garmin and send an alert to a web service if it goes below / above a certain number. Above below number and actual call isn't included yet, as I am currently getting an error that I can't figure out. Can't figure out out for the life of me. Grateful if anyone can help! Thanks in advance 

Error: Unexpected Type Error Details: Failed to start CIQ Application Stack

Encountered app crash.

On this line: 

Sensor.enableSensorEvents(method(:onSensor));
Here is my code: 

import Toybox.Application;

import Toybox.Sensor;

import Toybox.WatchUi;

import Toybox.Lang;

import Toybox.Communications; // Add this import statement

class HeartApp extends Application.AppBase {

function initialize() {

AppBase.initialize();

Sensor.setEnabledSensors([Sensor.SENSOR_HEARTRATE]);

}

function onStart(state) {

System.println("Test");

Sensor.enableSensorEvents(method(:onSensor));

}

function onStop(state) {

// Your onStop code here

}

function onUpdate(dc) {

// Your onUpdate code here

}

function onSensor(info as $.Toybox.Sensor.Info) as Void {

System.println(info);

// var heartRateVar = info.heartRate;

// System.println(heartRateVar);

// makeRequest(heartRateVar);

}

function onReceive(responseCode as Number, data as Dictionary?) as Void {

if (responseCode == 200) {

System.println("Request Successful");

} else {

System.println("Response: " + responseCode);

}

}

function makeRequest(heartRate) {

// Replace "">http://test" with your actual URL in the correct format (e.g., "">http://example.com")

var url = "">http://test";

var params = {

"definedParams" => "123456789abcdefg"

};

var options = {

:method => Communications.HTTP_REQUEST_METHOD_GET,

:headers => {

"Content-Type" => Communications.REQUEST_CONTENT_TYPE_URL_ENCODED

},

:responseType => Communications.HTTP_RESPONSE_CONTENT_TYPE_URL_ENCODED

};

// Make the web request

Communications.makeWebRequest(url, params, options, method(:onReceive));

}

}

function getApp() as HeartApp {

return Application.getApp() as HeartApp;

}