Error Name: Data Field Is Not Running

code from wizard and run for all instead of fenix5 (and of course it's logical to have this value in onLayout() to avoid unnecessary counting)

import Toybox.Activity;
import Toybox.Graphics;
import Toybox.Lang;
import Toybox.WatchUi;

class xxxView extends WatchUi.DataField {

    hidden var mValue as Numeric;

    function initialize() {
        DataField.initialize();
        mValue = 0.0f;
    }

    // Set your layout here. Anytime the size of obscurity of
    // the draw context is changed this will be called.
    function onLayout(dc as Dc) as Void {
        var obscurityFlags = DataField.getObscurityFlags();

        // Top left quadrant so we'll use the top left layout
        if (obscurityFlags == (OBSCURE_TOP | OBSCURE_LEFT)) {
            View.setLayout(Rez.Layouts.TopLeftLayout(dc));

        // Top right quadrant so we'll use the top right layout
        } else if (obscurityFlags == (OBSCURE_TOP | OBSCURE_RIGHT)) {
            View.setLayout(Rez.Layouts.TopRightLayout(dc));

        // Bottom left quadrant so we'll use the bottom left layout
        } else if (obscurityFlags == (OBSCURE_BOTTOM | OBSCURE_LEFT)) {
            View.setLayout(Rez.Layouts.BottomLeftLayout(dc));

        // Bottom right quadrant so we'll use the bottom right layout
        } else if (obscurityFlags == (OBSCURE_BOTTOM | OBSCURE_RIGHT)) {
            View.setLayout(Rez.Layouts.BottomRightLayout(dc));

        // Use the generic, centered layout
        } else {
            View.setLayout(Rez.Layouts.MainLayout(dc));
            var labelView = View.findDrawableById("label");
            labelView.locY = labelView.locY - 16;
            var valueView = View.findDrawableById("value");
            valueView.locY = valueView.locY + 7;
        }

        (View.findDrawableById("label") as Text).setText(Rez.Strings.label);
    }

    // The given info object contains all the current workout information.
    // Calculate a value and save it locally in this method.
    // Note that compute() and onUpdate() are asynchronous, and there is no
    // guarantee that compute() will be called before onUpdate().
    function compute(info as Activity.Info) as Void {
        // See Activity.Info in the documentation for available information.
        if(info has :currentHeartRate){
            if(info.currentHeartRate != null){
                mValue = info.currentHeartRate as Number;
            } else {
                mValue = 0.0f;
            }
        }
    }

    // Display the value you computed here. This will be called
    // once a second when the data field is visible.
    function onUpdate(dc as Dc) as Void {
        // Set the background color
        (View.findDrawableById("Background") as Text).setColor(getBackgroundColor());

        // Set the foreground color and value
        var value = View.findDrawableById("value") as Text;
        if (getBackgroundColor() == Graphics.COLOR_BLACK) {
            value.setColor(Graphics.COLOR_WHITE);
        } else {
            value.setColor(Graphics.COLOR_BLACK);
        }
        value.setText(mValue.format("%.2f"));

        // Call parent's onUpdate(dc) to redraw the layout
        View.onUpdate(dc);
    }

}

"Use of this method is only valid during the call to onUpdate()."