java.lang.NullPointerException: This exception has no message.

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This exception has no message.
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via Stack Overflow by Mounir Hamdane
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at org.apache.spark.sql.Dataset.schema(Dataset.scala:393)
at org.apache.spark.sql.Dataset.toDF(Dataset.scala:339)
at org.apache.spark.sql.Dataset.showString(Dataset.scala:239)

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