Adding Markers to MapWidget onEvents

I'm getting an exception when I'm trying to add simple markers to a map. The error is a little to cryptic for me to decode. Any ideas?

Here is the background:

Exception: 

@com.google.gwt.maps.client.overlays.Marker::setMapImpl(Lcom/google/gwt/maps/client/MapImpl;)([JavaScript object(34)]): Invalid value for property <map>: [object Object]

public class MapView extends Composite {

   private final VerticalPanel verticalPanel;

   private MapWidget mapWidget;

   private List<Marker> markers;

   public MapView() {

      verticalPanel = new VerticalPanel();

      markers = new ArrayList<Marker>();

      initWidget(verticalPanel);

      draw();

   }

   private void draw() {

      verticalPanel.clear();

      MapOptions opts = MapOptions.newInstance();

      opts.setZoom(4);

      opts.setCenter(App.createWashingtonMonumentLatLng());

      opts.setMapTypeId(MapTypeId.ROADMAP);

      mapWidget = new MapWidget(opts);

      verticalPanel.add(mapWidget);

      mapWidget.setSize("600px", "400px");

   }

   // Calling addMarker after the map has loaded by clicking on another UI element

   private void addMarker(final Node node) {

      if (node.getCoordinate() == null) return;

      LatLng center = node.getCoordinate().toLatLng();

      MarkerOptions options = MarkerOptions.newInstance();

      options.setPosition(center);

      options.setTitle(node.getName());

      final Marker marker = Marker.newInstance(options); 

      marker.setMap(mapWidget); // blows up here

      marker.addClickHandler(new ClickMapHandler() {

         @Override

         public void onEvent(ClickMapEvent event) {

            notifyListeners(new NodeChangeEvent(node));

         }

      });

      markers.add(marker);

   }

}

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