Issue with gwt-maps3-0.2b.jar

I am getting following error on my gwt console:

Caused by: java.lang.RuntimeException: Deferred binding failed for 'com.google.gwt.maps.client.impl.MapOptionsImpl' (did you forget to inherit a required module?)

    at com.google.gwt.dev.shell.GWTBridgeImpl.create(GWTBridgeImpl.java:53)

    at com.google.gwt.core.shared.GWT.create(GWT.java:57)

    at com.google.gwt.core.client.GWT.create(GWT.java:85)

    at com.google.gwt.maps.client.impl.MapOptionsImpl.<clinit>(MapOptionsImpl.java:31)

    at com.google.gwt.maps.client.MapOptions.<init>(MapOptions.java:40)

    at com.yieldstar.mpfui.client.ui.ViewMapPopUpPanel.buildUi(ViewMapPopUpPanel.java:85)

    at com.yieldstar.mpfui.client.ui.ViewMapPopUpPanel.<init>(ViewMapPopUpPanel.java:39)

    at com.yieldstar.mpfui.client.ui.EditProperty.viewMapDetail(EditProperty.java:2056)

    at com.yieldstar.mpfui.client.ui.EditProperty_BinderImpl$Widgets$10.onClick(EditProperty_BinderImpl.java:150)

    at com.google.gwt.event.dom.client.ClickEvent.dispatch(ClickEvent.java:56)

    at com.google.gwt.event.dom.client.ClickEvent.dispatch(ClickEvent.java:1)

    at com.google.gwt.event.shared.GwtEvent.dispatch(GwtEvent.java:1)

I am using gwt-maps3-0.2b.jar in gwt 2.5rc1 project.

I have also added the following line in gwt.xml file:

         <inherits name='com.google.gwt.maps.Maps' />

The code snippet that I tried to view a map is as following:

        final MapOptions options = new MapOptions();

        options.setZoom(8);

        options.setCenter(new LatLng(latitude, longitude));

        options.setMapTypeId(new MapTypeId().getRoadmap());

        options.setDraggable(true);

        options.setMapTypeControl(true);

        MapWidget mapWidget = new MapWidget(options);

        mapWidget.setSize("800px", "600px");

        dock.add(mapWidget);

Am I missing something here? I am trying to debug this from morning. Could someone please help me with this?

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