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java.lang.NullPointerException: null at com.datastax.bdp.util.LeaderManagerWatcher.checkNetwork(LeaderManagerWatcher.java:223)[dse-4.7.0.jar:4.7.0] at com.datastax.bdp.util.LeaderManagerWatcher.getNextView(LeaderManagerWatcher.java:456)[dse-4.7.0.jar:4.7.0] at com.datastax.bdp.util.LeaderManagerWatcher.run(LeaderManagerWatcher.java:326)[dse-4.7.0.jar:4.7.0] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)[na:1.7.0_67] at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)[na:1.7.0_67] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)[na:1.7.0_67] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)[na:1.7.0_67] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)[na:1.7.0_67] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)[na:1.7.0_67] at java.lang.Thread.run(Thread.java:745)[na:1.7.0_67]