Hello all, I am trying to migrate my application from using JBoss MQ to JBoss Messaging. I have followed the doc and installed JBoss Messaging 1.2.0 SP1, I ran the queue example and it worked fine. However, when I tried to run my client (external) app, I have the following error: anonymous wrote : | javax.naming.CommunicationException [Root exception is java.io.InvalidClassException: org.jboss.remoting.InvokerLocator; local class incompatible: stream classdesc serialVersionUID = -2909329895029296248, local class serialVersionUID = -4977622166779282521] | I am using the jboss-messaging-client.jar from the jboss-messaging-1.2.0.sp1 directory. Thanks for your help. -tony View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4034722#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...