Serializing different objects in one class that implements IsSerializable

I created a class that implements IsSerializable.  I am using Polygon and LatLng within this class called BoundingBox.  I am getting issues with no being able to instantiate Polygon without a constructor.  Do you create a separate Polygon class?

[ERROR] com.google.gwt.maps.client.overlay.Polygon has no available instantiable subtypes.

                                                                                   &

  [ERROR] subtype com.google.gwt.maps.client.overlay.Polygon is not default instantiable (it must have a zero-argument constructor or no constructors at all) and has no custom serializer. 

Can anyone point me in the right direction???

Thanks!

public class BoundingBox implements IsSerializable {

    private LatLng Coordinate_One;

    private LatLng Coordinate_Two;

    private LatLng Coordinate_Three;

    private LatLng Coordinate_Four;

    private Polygon poly;

    public BoundingBox() {        

    }        

    

    public Polygon getPoly() {

        return poly;

    }

    public void setPoly(Polygon poly) {

        this.poly = poly;

    }   

    public Polygon CreatePolygon(BoundingBox bbox) // param = file type object

    {

        LatLng[] polyOverlay = new LatLng[5];

        polyOverlay[0] = LatLng.newInstance(bbox.getCoordinate_One()

                .getLatitude(), bbox.getCoordinate_One().getLongitude());

        polyOverlay[1] = LatLng.newInstance(bbox.getCoordinate_Two()

                .getLatitude(), bbox.getCoordinate_Two().getLongitude());

        polyOverlay[2] = LatLng.newInstance(bbox.getCoordinate_Three()

                .getLatitude(), bbox.getCoordinate_Three().getLongitude());

        polyOverlay[3] = LatLng.newInstance(bbox.getCoordinate_Four()

                .getLatitude(), bbox.getCoordinate_Four().getLongitude());

        polyOverlay[4] = LatLng.newInstance(bbox.getCoordinate_One()

                .getLatitude(), bbox.getCoordinate_One().getLongitude());

        this.poly = new Polygon(polyOverlay);

        return poly;

    }

 public LatLng getCoordinate_One() {

        return Coordinate_One;

    }

    public void setCoordinate_One(LatLng coordinate_One) {

        Coordinate_One = coordinate_One;

    }...etc for the rest of the sets/gets

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