org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1066: Unable to open iterator for alias Logs

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    Root Cause Analysis

    1. java.lang.RuntimeException

      Could not resolve error that occured when launching map reduce job: java.lang.NullPointerException

      at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher$JobControlThreadExceptionHandler.uncaughtException()
    2. org.apache.pig
      MapReduceLauncher$JobControlThreadExceptionHandler.uncaughtException
      1. org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher$JobControlThreadExceptionHandler.uncaughtException(MapReduceLauncher.java:600)
      1 frame
    3. Java RT
      Thread.dispatchUncaughtException
      1. java.lang.Thread.dispatchUncaughtException(Thread.java:1964)
      1 frame