I'm trying to use ajax4jsf 1.1.1 and richafaces 3.0.1 with MyFaces and Tomahawk 1.1.5 + facelets 1.1.11

In a single xhtml file I'm having this error :

java.lang.NoSuchMethodError: org.apache.myfaces.renderkit.html.util.DummyFormUtils.findNestingForm(Ljavax/faces/component/UIComponent;Ljavax/faces/context/FacesContext;)
Lorg/apache/myfaces/shared_tomahawk/renderkit/html/util/FormInfo;

searching in google some link has a description that is a depedency problem ...

Does any one had this problem before ?