ERROR: GWT 2.3 + gwt-maps

Hi, i using GWT 2.3 with gwt-maps.jar , but i've trouble, didn't
compile, but i follow all steps that guide.

A part of problems are listed bellow:

[ERROR] Errors in 'jar:file:/C:/eclipse/gwt-maps-1.1.0/gwt-
maps3-0.2a.jar!/com/google/gwt/maps/client/base/LatLng.java'
[ERROR] Internal compiler error
java.lang.IncompatibleClassChangeError: Found interface
com.google.gwt.core.ext.typeinfo.JClassType, but class was expected
at
com.google.gwt.jsio.rebind.JSWrapperGenerator.generate(JSWrapperGenerator.java:
276)
at
com.google.gwt.core.ext.GeneratorExtWrapper.generate(GeneratorExtWrapper.java:
48)

Someone can help me?

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