jboss-seam-ui.jar. Add it to WEB-INF/lib in your .war View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3975532#3975532 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3975532