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java.lang.NullPointerException: 	at actors.AttendeeActor.(AttendeeActor.java:29)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)	at java.lang.Class.newInstance(Class.java:442)	at akka.util.Reflect$.instantiate(Reflect.scala:44)	at akka.actor.NoArgsReflectConstructor.produce(IndirectActorProducer.scala:105)	at akka.actor.Props.newActor(Props.scala:213)	at akka.actor.ActorCell.newActor(ActorCell.scala:562)	at akka.actor.ActorCell.create(ActorCell.scala:588)	at akka.actor.ActorCell.invokeAll$1(ActorCell.scala:461)	at akka.actor.ActorCell.systemInvoke(ActorCell.scala:483)	at akka.dispatch.Mailbox.processAllSystemMessages(Mailbox.scala:282)	at akka.dispatch.Mailbox.run(Mailbox.scala:223)	at akka.dispatch.Mailbox.exec(Mailbox.scala:234)	at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)	at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)	at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)	at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)