gistfile1.txt

	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
	at java.util.Collections$SynchronizedCollection.add(Collections.java:2035)
	at com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:109)
	at com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:18)
	at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:648)
	at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.read(FieldSerializer.java:605)
	... 12 more
[ Executor task launch worker-0] Executor                       INFO  Finished task 1.0 in stage 3.0 (TID 13). 1771602 bytes result sent to driver
[       dispatcher-event-loop-2] TaskSchedulerImpl              DEBUG parentName: , name: TaskSet_3, runningTasks: 2
[      dag-scheduler-event-loop] TaskSchedulerImpl              INFO  Cancelling stage 3
[          task-result-getter-0] TaskResultGetter               ERROR Exception while getting task result
com.esotericsoftware.kryo.KryoException: java.lang.NullPointerException
Serialization trace:
listenerMetaData (org.deeplearning4j.spark.impl.paramavg.aggregator.ParameterAveragingAggregationTuple)
	at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.read(FieldSerializer.java:626)
	at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:221)
	at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:729)
	at org.apache.spark.serializer.KryoSerializerInstance.deserialize(KryoSerializer.scala:311)
	at org.apache.spark.scheduler.DirectTaskResult.value(TaskResult.scala:97)
	at org.apache.spark.scheduler.TaskResultGetter$$anon$2$$anonfun$run$1.apply$mcV$sp(TaskResultGetter.scala:60)
	at org.apache.spark.scheduler.TaskResultGetter$$anon$2$$anonfun$run$1.apply(TaskResultGetter.scala:51)
	at org.apache.spark.scheduler.TaskResultGetter$$anon$2$$anonfun$run$1.apply(TaskResultGetter.scala:51)
	at org.apache.spark.util.Utils$.logUncaughtExceptions(Utils.scala:1817)
	at org.apache.spark.scheduler.TaskResultGetter$$anon$2.run(TaskResultGetter.scala:50)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
	at java.util.Collections$SynchronizedCollection.add(Collections.java:2035)
	at com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:109)
	at com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:18)
	at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:648)
	at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.read(FieldSerializer.java:605)
	... 12 more
[      dag-scheduler-event-loop] TaskSchedulerImpl              INFO  Stage 3 was cancelled
[       dispatcher-event-loop-1] Executor                       INFO  Executor is trying to kill task 3.0 in stage 3.0 (TID 15)
[       dispatcher-event-loop-1] Executor                       INFO  Executor is trying to kill task 2.0 in stage 3.0 (TID 14)
[      dag-scheduler-event-loop] DAGScheduler                   INFO  ResultStage 3 (aggregate at ParameterAveragingTrainingMaster.java:772) failed in 3.018 s
[      dag-scheduler-event-loop] DAGScheduler                   DEBUG After removal of stage 3, remaining stages = 0
[                          main] DAGScheduler                   INFO  Job 3 failed: aggregate at ParameterAveragingTrainingMaster.java:772, took 3.033404 s

org.apache.spark.SparkException: Job aborted due to stage failure: Exception while getting task result: com.esotericsoftware.kryo.KryoException: java.lang.NullPointerException
Serialization trace:
listenerMetaData (org.deeplearning4j.spark.impl.paramavg.aggregator.ParameterAveragingAggregationTuple)