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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 java.lang.reflect.Method.invoke(Native Method)	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 com.sun.management.jmx.MBeanServerImpl.getAttribute(MBeanServerImpl.java:1151)	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)