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

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at com.twitter.heron.instance.spout.SpoutInstance.start(
at com.twitter.heron.instance.Slave.startInstance(
at com.twitter.heron.instance.Slave.handleNewAssignment(
at com.twitter.heron.instance.Slave.access$200(
at com.twitter.heron.instance.Slave$
at com.twitter.heron.common.basics.WakeableLooper.executeTasksOnWakeup(
at com.twitter.heron.common.basics.WakeableLooper.runOnce(
at com.twitter.heron.common.basics.WakeableLooper.loop(
at java.util.concurrent.ThreadPoolExecutor.runWorker(
at java.util.concurrent.ThreadPoolExecutor$

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