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java.lang.NullPointerException: null	at com.datastax.bdp.util.LeaderManagerWatcher.checkNetwork(LeaderManagerWatcher.java:223)	at com.datastax.bdp.util.LeaderManagerWatcher.getNextView(LeaderManagerWatcher.java:456)	at com.datastax.bdp.util.LeaderManagerWatcher.run(LeaderManagerWatcher.java:326)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)	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)