Error unmarshaling return header

Hi, I am having this exception. Do anyone know what may cause this and
how can I get rid of it?

Also, is there any way to remove a message from a JMS queue?

I am using openjms 0.7.6.1 jar

thanks in advance

Kenji

>>>>>>>>


09:10:48.157 ERROR [Scheduler-Worker-4] -
org.exolab.jms.server.ClientDisconnectionException: Failed in
onMessage java.rmi.UnmarshalException: Error unmarshaling return
header; nested exception is:
        java.io.EOFException
org.exolab.jms.server.ClientDisconnectionException: Failed in
onMessage java.rmi.UnmarshalException: Error unmarshaling return
header; nested exception is:
        java.io.EOFException
        at org.exolab.jms.server.rmi.RmiJmsServerSession.onMessage(RmiJmsServerSession.java:572)
        at org.exolab.jms.server.JmsServerSession.onMessage(JmsServerSession.java:942)
        at org.exolab.jms.messagemgr.QueueConsumerEndpoint.deliverMessages(QueueConsumerEndpoint.java:177)
        at org.exolab.jms.messagemgr.ConsumerEndpoint.run(ConsumerEndpoint.java:425)
        at org.exolab.core.threadPool.ThreadPoolWorker.runIt(ThreadPoolWorker.java:191)
        at org.exolab.core.threadPool.ThreadPoolWorker.runWork(ThreadPoolWorker.java:178)
        at org.exolab.core.threadPool.ThreadPoolWorker.access$000(ThreadPoolWorker.java:67)
        at org.exolab.core.threadPool.ThreadPoolWorker$1.run(ThreadPoolWorker.java:122)
        at java.lang.Thread.run(Thread.java:595)


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