Hi, no for me it's the same, I putter the <a:form>...</a:form> out of all and it give to me the same error... another issue I found: I have <rich:tabPanel switchType="ajax" ... If I click 2 or more time to a tab to switch the tab panel it give me the same error... So I think that the problem is related to multiple ajax requests... Demetrio View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4076959#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...