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

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java.lang.NullPointerException:
at storm.kafka.KafkaSpout.open(KafkaSpout.java:80)
at backtype.storm.topology.IRichSpoutDelegate.open(IRichSpoutDelegate.java:43)
at com.twitter.heron.instance.spout.SpoutInstance.start(SpoutInstance.java:125)
at com.twitter.heron.instance.Slave.startInstance(Slave.java:173)
at com.twitter.heron.instance.Slave.handleNewAssignment(Slave.java:159)
at com.twitter.heron.instance.Slave.access$200(Slave.java:40)
at com.twitter.heron.instance.Slave$1.run(Slave.java:85)
at com.twitter.heron.common.basics.WakeableLooper.executeTasksOnWakeup(WakeableLooper.java:142)
at com.twitter.heron.common.basics.WakeableLooper.runOnce(WakeableLooper.java:74)
at com.twitter.heron.common.basics.WakeableLooper.loop(WakeableLooper.java:64)
at com.twitter.heron.instance.Slave.run(Slave.java:169)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

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