Please Help: Getting Exception java.lang.NoSuchMethodError: isDuplexConnection()Z

[Martin S.]

I managed to get a test-client communicating using tcp://localhost:8088 with a test-server which starts an embedded ActiveMQ broker. But whenever I try to call a remote method, the server throws the following exception:

Exception in thread "ActiveMQ Transport Server: tcp://sioux:8088" java.lang.NoSuchMethodError: org.apache.activemq.command.BrokerInfo.isDuplexConnection()Z
        at org.apache.activemq.openwire.v2.BrokerInfoMarshaller.tightMarshal1(BrokerInfoMarshaller.java:109)

The versions i use are Lingo 1.3, ActiveMQ 4.1.0 and the Spring Framework 2.0. I tried also with ActiveMQ 4.2.0-SNAPSHOT but got the same exception.

Does anyone have a clue how I can solve this problem?
Thanks for any hint!

Martin