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Lost task 0.0 in stage 2.0 (TID 16, spark-w-0.c.clean-feat-131014.internal): org.apache.spark.api.python.PythonException: Traceback (most recent call last): File "/usr/lib/spark/python/pyspark/worker.py", line 98, in main command
org.apache.spark.scheduler.TaskSetManager: Lost task 0.0 in stage 2.0 (TID 16, spark-w-0.c.clean-feat-131014.internal): org.apache.spark.api.python.PythonException: Traceback (most recent call last):
      File "/usr/lib/spark/python/pyspark/worker.py", line 98, in main
        command = pickleSer._read_with_length(infile)
      File "/usr/lib/spark/python/pyspark/serializers.py", line 164, in _read_with_length
        return self.loads(obj)
      File "/usr/lib/spark/python/pyspark/serializers.py", line 422, in loads
        return pickle.loads(obj)
    ImportError: No module named nltk.tokenize	at org.apache.spark.api.python.PythonRunner$$anon$1.read(PythonRDD.scala:166)	at org.apache.spark.api.python.PythonRunner$$anon$1.(PythonRDD.scala:207)	at org.apache.spark.api.python.PythonRunner.compute(PythonRDD.scala:125)	at org.apache.spark.api.python.PythonRDD.compute(PythonRDD.scala:70)	at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:306)	at org.apache.spark.rdd.RDD.iterator(RDD.scala:270)	at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:66)	at org.apache.spark.scheduler.Task.run(Task.scala:89)	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:214)	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)