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org.apache.spark.SparkException: A master URL must be set in your configuration	at org.apache.spark.SparkContext.(SparkContext.scala:401)	at	at com.ts.clustering.TrainModel.(	at com.ts.clustering.TrainModel$	at com.ts.clustering.TrainModel$	at$$anonfun$toScalaFunction$1.apply(JavaPairRDD.scala:1015)	at scala.collection.Iterator$$anon$	at scala.collection.Iterator$$anon$14.hasNext(Iterator.scala:389)	at