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assertion failed
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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:192)	at org.apache.spark.deploy.yarn.ApplicationMaster.run(ApplicationMaster.scala:106)	at org.apache.spark.deploy.yarn.ApplicationMaster$$anonfun$main$1.apply$mcV$sp(ApplicationMaster.scala:404)	at org.apache.spark.deploy.SparkHadoopUtil$$anon$1.run(SparkHadoopUtil.scala:53)	at org.apache.spark.deploy.SparkHadoopUtil$$anon$1.run(SparkHadoopUtil.scala:52)	at java.security.AccessController.doPrivileged(Native Method)	at javax.security.auth.Subject.doAs(Subject.java:415)	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1594)	at org.apache.spark.deploy.SparkHadoopUtil.runAsSparkUser(SparkHadoopUtil.scala:52)	at org.apache.spark.deploy.yarn.ApplicationMaster$.main(ApplicationMaster.scala:403)	at org.apache.spark.deploy.yarn.ApplicationMaster.main(ApplicationMaster.scala)