java.lang.AssertionError: assertion failed

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assertion failed: timeout (15 seconds) during expectMsg: Terminated Actor[artery://RemoteNodeRestartDeathWatchSpec@a5.moxie:57212/user/subject#-1171478643]
java.lang.AssertionError: assertion failed
at scala.Predef$.assert(Predef.scala:156)
at ml.dmlc.xgboost4j.scala.rabit.handler.RabitWorkerHandler$$anonfun$2.applyOrElse(RabitWorkerHandler.scala:110)
at ml.dmlc.xgboost4j.scala.rabit.handler.RabitWorkerHandler$$anonfun$2.applyOrElse(RabitWorkerHandler.scala:108)
at scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:36)
at ml.dmlc.xgboost4j.scala.rabit.handler.RabitWorkerHandler.processEvent(RabitWorkerHandler.scala:39)
at akka.actor.FSM$class.akka$actor$FSM$$processMsg(FSM.scala:598)
at akka.actor.FSM$$anonfun$receive$1.applyOrElse(FSM.scala:592)
at ml.dmlc.xgboost4j.scala.rabit.handler.RabitWorkerHandler.aroundReceive(RabitWorkerHandler.scala:39)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)
at akka.actor.ActorCell.invoke(ActorCell.scala:487)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:238)
at akka.dispatch.Mailbox.run(Mailbox.scala:220)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

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