And I just looked at that error, and looked at the source code. In src/ui/org/jboss/seam/ui/facelet/SeamFaceletViewHandler.java, it says: public class SeamFaceletViewHandler extends FaceletViewHandler so SeamFaceletViewHandler most certainly is a FaceletViewHandler. There must be a bug in org.apache.myfaces.config.FacesConfigurator.getApplicationObject(FacesConfigurator.java:536) to be causing this, because the class is correct. Hmm, any ideas? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3996256#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...