Trying to use Google Maps Native - Ionic 2 (Uncaught (in promise): [object Object])

Hello there,

I am trying to use the Google Maps Native from ionic 2. The ionic’s documentation provides the follow usage to the home.ts file:

import { GoogleMap, GoogleMapsEvent, GoogleMapsLatLng, CameraPosition, GoogleMapsMarkerOptions, GoogleMapsMarker} from 'ionic-native';

export class HomePage { 
constructor() {}

ngAfterViewInit() { this.loadMap();}

loadMap() {
 let element: HTMLElement = document.getElementById('map');
 let map = new GoogleMap(element);
 // create LatLng object let ionic: GoogleMapsLatLng = new GoogleMapsLatLng(43.0741904,-89.3809802);
 // create CameraPosition let position: CameraPosition = {   target: ionic,   zoom: 18,   tilt: 30 };
 // listen to MAP_READY event => {   // move the map's camera to position   map.moveCamera(position); // works on iOS and Android});

 // create new marker let markerOptions: GoogleMapsMarkerOptions = {   position: ionic,   title: 'Ionic' };
 map.addMarker(markerOptions)   .then((marker: GoogleMapsMarker) => {      marker.showInfoWindow();    }); }}

So I created the follow home.html file:

        <ion-title>      Map    </ion-title>    
        <ion-buttons end>      <button ion-button (click)="addMarker()"> 
       <ion-icon name="add"></ion-icon>Add Marker</button>    </ion-buttons>    

     <div id="map"></div>  

But when I run the application on the browser, Iḿ getting the error " Uncaught (in promise): [object Object] "
What should I do?