java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at weblogic.utils.collections.NumericValueHashtable.containsKey(NumericValueHashtable.java:138)
at weblogic.cluster.replication.ReplicationManager.getSecondaryDistributionNames(ReplicationManager.java:1245)
at weblogic.cluster.ClusterRuntime.getSecondaryDistributionNames(ClusterRuntime.java:100)
at weblogic.management.internal.DynamicMBeanImpl.getAttribute(DynamicMBeanImpl.java:483)
at weblogic.management.internal.DynamicMBeanImpl.getAttribute(DynamicMBeanImpl.java:449)
at com.sun.management.jmx.MBeanServerImpl.getAttribute(MBeanServerImpl.java:1181)
at weblogic.management.internal.RemoteMBeanServerImpl_WLSkel.invoke(Unknown Source)
at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:296)
at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:265)
at weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java:22)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)

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