GWT Material Design Addins

I followed these steps to use the MaterialWindow addin from the gwt-material-addins-1.5.0.jar in an application.

1. Downloaded gwt-material-addins-1.5.0.jar and added to application's build path in Eclipse.
2. Added the line <inherits name="gwt.material.design.addins.GwtMaterialAddins"/> in the ..gwt.xml
   
3. Added the line xmlns:ma="urn:import:gwt.material.design.addins.client" in the UiBinder.
   
4. Then started adding the line <ma:window.MaterialWindow ui:field="window" width="50%" title="Documents"> in the UiBinder 
   

But MaterialWindow is not visible to the UiBinder.  Any idea what could be wrong?

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