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java.lang.UnsupportedOperationException: empty.head	at scala.collection.immutable.Vector.head(Vector.scala:162)	at kafka.consumer.SimpleConsumer$.earliestOrLatestOffset(SimpleConsumer.scala:45)	at kafka.tools.SimpleConsumerShell$.main(SimpleConsumerShell.scala:169)	at kafka.tools.SimpleConsumerShell.main(SimpleConsumerShell.scala)