java.lang.NullPointerException: null

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java.lang.NullPointerException: null
at me.prettyprint.cassandra.connection.NodeDiscovery.discoverNodes(NodeDiscovery.java:79)
at me.prettyprint.cassandra.connection.NodeDiscovery.doAddNodes(NodeDiscovery.java:52)
at me.prettyprint.cassandra.connection.NodeAutoDiscoverService.doAddNodes(NodeAutoDiscoverService.java:45)
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)

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