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$2.applyOrElse(RabitWorkerHandler.scala:108)
at scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:36)
at ml.dmlc.xgboost4j.scala.rabit.handler.RabitWorkerHandler.processEvent(RabitWorkerHandler.scala:39)
at ml.dmlc.xgboost4j.scala.rabit.handler.RabitWorkerHandler.aroundReceive(RabitWorkerHandler.scala:39)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:238)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(

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