My template is no different from the one that comes with the mail example of Seam. Mail Template: ============= <m:message xmlns="http://www.w3.org/1999/xhtml" xmlns:m="http://jboss.com/products/seam/mail" xmlns:h="http://java.sun.com/jsf/html"> <m:from name="Peter" address=&quot;peter(a)example.com&quot; /> <m:to name="#{person.firstname} #{person.lastname}">#{person.address}</m:to> <m:subject>Try out Seam!</m:subject> <m:body> <h:outputText value="Dear #{person.firstname}" />, You can try out Seam by visiting http://labs.jboss.com/jbossseam. Regards Peter </m:body> </m:message> Menu Items: ============== <ice:form xmlns="http://www.w3.org/1999/xhtml" xmlns:ui="http://java.sun.com/jsf/facelets" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core" xmlns:s="http://jboss.com/products/seam/taglib" xmlns:ice="http://www.icesoft.com/icefaces/component"> <ice:panelGroup id="menuPanel" styleClass="formBorderHighlight"> <ice:menuBar orientation="horizontal"> <ice:menuItem value="Top level" > <ice:menuItem value="Child 1" /> </ice:menuItem> </ice:menuBar> </ice:panelGroup> </ice:form> When I remove child 1 Item or move the child 1 to parent Level, I don't get the error. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4024636#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...