Getting partition null or empty error @Apache Apex-Kafka Integration

Mon, 11 Jul 2016 21:55:03 -0700 

Hi,

I am getting below given exception while launching kafka Application.
Please let me know how to fix this.

java.lang.IllegalStateException: Partitioner returns null or empty.
        at 
com.datatorrent.stram.plan.physical.PhysicalPlan.initPartitioning(PhysicalPlan.java:605)
        at 
com.datatorrent.stram.plan.physical.PhysicalPlan.addLogicalOperator(PhysicalPlan.java:1497)
        at 
com.datatorrent.stram.plan.physical.PhysicalPlan.<init>(PhysicalPlan.java:344)
        at 
com.datatorrent.stram.StreamingContainerManager.<init>(StreamingContainerManager.java:362)
        at 
com.datatorrent.stram.StreamingContainerManager.getInstance(StreamingContainerManager.java:2979)
        at 
com.datatorrent.stram.StreamingAppMasterService.serviceInit(StreamingAppMasterService.java:550)
        at 
org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
        at 
com.datatorrent.stram.StreamingAppMaster.main(StreamingAppMaster.java:101)
2016-07-11 22:24:48,250 ERROR
com.datatorrent.stram.StreamingAppMaster: Exiting Application Master
java.lang.IllegalStateException: Partitioner returns null or empty.
        at 
com.datatorrent.stram.plan.physical.PhysicalPlan.initPartitioning(PhysicalPlan.java:605)
        at 
com.datatorrent.stram.plan.physical.PhysicalPlan.addLogicalOperator(PhysicalPlan.java:1497)
        at 
com.datatorrent.stram.plan.physical.PhysicalPlan.<init>(PhysicalPlan.java:344)
        at 
com.datatorrent.stram.StreamingContainerManager.<init>(StreamingContainerManager.java:362)
        at 
com.datatorrent.stram.StreamingContainerManager.getInstance(StreamingContainerManager.java:2979)
        at 
com.datatorrent.stram.StreamingAppMasterService.serviceInit(StreamingAppMasterService.java:550)
        at 
org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
        at 
com.datatorrent.stram.StreamingAppMaster.main(StreamingAppMaster.java:101)

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