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java.lang.AssertionError: assertion failed	at scala.Predef$.assert(Predef.scala:165)	at org.apache.spark.deploy.yarn.ApplicationMaster.waitForSparkContextInitialized(ApplicationMaster.scala:234)	at org.apache.spark.deploy.yarn.ApplicationMaster.run(ApplicationMaster.scala:107)	at org.apache.spark.deploy.yarn.ApplicationMaster$.main(ApplicationMaster.scala:480)	at org.apache.spark.deploy.yarn.ApplicationMaster.main(ApplicationMaster.scala)