java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.test.B.endActor(Test.scala:62)
at com.test.B$$anonfun$scheduleEndActor$1.apply$mcV$sp(Test.scala:60)
at akka.actor.Scheduler$$anon$2.run(Scheduler.scala:78)
at akka.actor.LightArrayRevolverScheduler$$anon$2$$anon$1.run(LightArrayRevolverScheduler.scala:104)
at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:39)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$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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