java.lang.IllegalStateException: named 'null' cannot be serialized

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    Root Cause Analysis

    1. java.lang.IllegalStateException

      named 'null' cannot be serialized

      at org.apache.crunch.impl.mem.collect.MemCollection.verifySerializable()
    2. org.apache.crunch
      MemCollection.parallelDo
      1. org.apache.crunch.impl.mem.collect.MemCollection.verifySerializable(MemCollection.java:110)
      2. org.apache.crunch.impl.mem.collect.MemCollection.parallelDo(MemCollection.java:129)
      2 frames