"shane.bryzak(a)jboss.com" wrote : Is it possible for you to test with the latest CVS version of Seam? I just recently made a change to fix out-of-scope references with Ajax callbacks, which I suspect fixes your error also. Thank you for your reply. I've already discovered that error happens when page reload causes Seam.Remoting.subscribe(...) to be called second time. I added Seam.Remoting.unsubscribe(...) right before Seam.Remoting.subscribe(...) and this solved the problem. We would like to finish this project on 1.2.1GA and upgrade after that. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4080758#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...