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java.util.ConcurrentModificationException: 	at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)	at java.util.AbstractList$Itr.next(AbstractList.java:343)	at com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:74)	at com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:18)	at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501)	at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)	at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)	at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501)	at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)	at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)	at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501)	at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)	at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)	at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501)	at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)	at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)	at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501)	at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)	at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)	at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:501)	at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:564)	at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)	at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:568)	at com.twitter.chill.SerDeState.writeClassAndObject(SerDeState.java:64)	at com.twitter.chill.KryoPool.toBytesWithClass(KryoPool.java:116)	at com.twitter.chill.MeatLocker.(MeatLocker.scala:29)	at com.twitter.chill.MeatLocker$.apply(MeatLocker.scala:21)	at com.twitter.scalding.FlatMapFunction.(Operations.scala:36)	at com.twitter.scalding.RichPipe$$anonfun$flatMapTo$1.apply(RichPipe.scala:394)	at com.twitter.scalding.RichPipe$$anonfun$flatMapTo$1.apply(RichPipe.scala:394)	at com.twitter.scalding.RichPipe.eachTo(RichPipe.scala:441)	at com.twitter.scalding.RichPipe.flatMapTo(RichPipe.scala:394)	at com.twitter.scalding.typed.TypedPipe.pipe(TypedPipe.scala:59)	at com.twitter.scalding.typed.TypedPipe.write(TypedPipe.scala:170)	at com.linkedin.kryo.KryoBug.(KryoBug.scala:27)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)	at java.lang.reflect.Constructor.newInstance(Constructor.java:513)	at com.twitter.scalding.Job$.apply(Job.scala:41)	at com.twitter.scalding.Tool.getJob(Tool.scala:49)	at com.twitter.scalding.Tool.run(Tool.scala:69)	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)	at com.linkedin.kryo.KryoBug$.main(KryoBug.scala:18)	at com.linkedin.kryo.KryoBug.main(KryoBug.scala)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at scala_maven_executions.MainHelper.runMain(MainHelper.java:164)	at scala_maven_executions.MainWithArgsInFile.main(MainWithArgsInFile.java:26)