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java.lang.RuntimeException: java.lang.NullPointerException	at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:522)	at org.apache.spark.sql.hive.client.ClientWrapper.(ClientWrapper.scala:204)	at org.apache.spark.sql.hive.client.IsolatedClientLoader.createClient(IsolatedClientLoader.scala:238)	at org.apache.spark.sql.hive.HiveContext.executionHive$lzycompute(HiveContext.scala:218)	at org.apache.spark.sql.hive.HiveContext.executionHive(HiveContext.scala:208)	at org.apache.spark.sql.hive.HiveContext.functionRegistry$lzycompute(HiveContext.scala:462)	at org.apache.spark.sql.hive.HiveContext.functionRegistry(HiveContext.scala:461)	at org.apache.spark.sql.UDFRegistration.(UDFRegistration.scala:40)	at org.apache.spark.sql.SQLContext.(SQLContext.scala:330)	at org.apache.spark.sql.hive.HiveContext.(HiveContext.scala:90)	at org.apache.spark.sql.hive.HiveContext.(HiveContext.scala:101)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)	at org.apache.spark.repl.SparkILoop.createSQLContext(SparkILoop.scala:1028)	at $iwC$$iwC.(:15)	at $iwC.(:24)