Active MQInstanceAlreadyExists Exception

[Kinguzzo]

Hi,
In the production enviroment (4 nodes those use 4 MQ queue connected themselves) i'm getting these kind of warning messages:

WARN  [ActiveMQ NIO Worker 4218] org.apache.activemq.network.MBeanBridgeDestination:100 - Failed to register queue://WS_FEED
javax.management.InstanceAlreadyExistsException: org.apache.activemq:brokerName=applicationBroker,connector=duplexNetworkConnectors,networkConnectorName=#12,networkBridge=tcp_//xx.xxx.xx.xx_60859,type=Broker,direction=inbound,destinationType=Queue,destinationName=WS_FEED
        at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:437)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerWithRepository(DefaultMBeanServerInterceptor.java:1898)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:966)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:900)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:324)
        at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:522)
        at org.apache.activemq.broker.jmx.ManagementContext.registerMBean(ManagementContext.java:380)
        at org.apache.activemq.broker.jmx.AnnotatedMBean.registerMBean(AnnotatedMBean.java:72)
        at org.apache.activemq.network.MBeanBridgeDestination.onInboundMessage(MBeanBridgeDestination.java:96)
        at org.apache.activemq.network.MBeanNetworkListener.onInboundMessage(MBeanNetworkListener.java:115)
        at org.apache.activemq.network.DemandForwardingBridgeSupport.serviceInboundMessage(DemandForwardingBridgeSupport.java:1672)
        at org.apache.activemq.network.DemandForwardingBridgeSupport.serviceRemoteCommand(DemandForwardingBridgeSupport.java:643)
        at org.apache.activemq.network.DemandForwardingBridgeSupport$3.onCommand(DemandForwardingBridgeSupport.java:224)
        at org.apache.activemq.transport.ResponseCorrelator.onCommand(ResponseCorrelator.java:116)
        at org.apache.activemq.transport.MutexTransport.onCommand(MutexTransport.java:50)
        at org.apache.activemq.transport.WireFormatNegotiator.onCommand(WireFormatNegotiator.java:113)
        at org.apache.activemq.transport.AbstractInactivityMonitor.onCommand(AbstractInactivityMonitor.java:270)
        at org.apache.activemq.transport.TransportSupport.doConsume(TransportSupport.java:83)
        at org.apache.activemq.transport.nio.NIOTransport.serviceRead(NIOTransport.java:138)
        at org.apache.activemq.transport.nio.NIOTransport$1.onSelect(NIOTransport.java:69)
        at org.apache.activemq.transport.nio.SelectorSelection.onSelect(SelectorSelection.java:94)
        at org.apache.activemq.transport.nio.SelectorWorker$1.run(SelectorWorker.java:119)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)

Have you an idea regarding the source problem that causes this kind of warning?

Any hint will be appreciated...i'm in trouble :|

BR,
F.