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java.lang.NullPointerException: 	at org.apache.spark.sql.SparkSession.sessionState$lzycompute(SparkSession.scala:112)	at org.apache.spark.sql.SparkSession.sessionState(SparkSession.scala:110)	at org.apache.spark.sql.DataFrameReader.(DataFrameReader.scala:535)	at org.apache.spark.sql.SparkSession.read(SparkSession.scala:595)	at org.apache.spark.sql.SQLContext.read(SQLContext.scala:504)	at SparkJSONConsumer$1.lambda$2(SparkJSONConsumer.java:73)