java.lang.NullPointerException: fd object

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java.lang.NullPointerException: fd object
at java.net.PlainDatagramSocketImpl.leave(Native Method)
at java.net.MulticastSocket.leaveGroup(MulticastSocket.java:250)
at weblogic.cluster.TDMSocketIPM.close(TDMSocketIPM.java:89)
at weblogic.cluster.ClusterManager.shutdown(ClusterManager.java:185)
at weblogic.cluster.ClusterMain.leaveCluster(ClusterMain.java:267)

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