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java.lang.NullPointerException: 	at akka.kamon.instrumentation.DispatcherInstrumentation.afterCreateExecutorService(DispatcherInstrumentation.scala:115)	at akka.dispatch.ThreadPoolConfig$ThreadPoolExecutorServiceFactory.createExecutorService(ThreadPoolBuilder.scala:88)	at akka.dispatch.Dispatcher$LazyExecutorServiceDelegate.executor$lzycompute(Dispatcher.scala:44)	at akka.dispatch.Dispatcher$LazyExecutorServiceDelegate.executor(Dispatcher.scala:44)	at akka.dispatch.ExecutorServiceDelegate$class.execute(ThreadPoolBuilder.scala:212)	at akka.dispatch.Dispatcher$LazyExecutorServiceDelegate.execute(Dispatcher.scala:43)	at akka.dispatch.Dispatcher.executeTask(Dispatcher.scala:76)	at akka.dispatch.MessageDispatcher.unbatchedExecute(AbstractDispatcher.scala:143)	at akka.dispatch.BatchingExecutor$class.execute(BatchingExecutor.scala:123)	at akka.dispatch.MessageDispatcher.execute(AbstractDispatcher.scala:83)	at akka.util.SerializedSuspendableExecutionContext.attach(SerializedSuspendableExecutionContext.scala:75)	at akka.util.SerializedSuspendableExecutionContext.execute(SerializedSuspendableExecutionContext.scala:76)	at akka.io.SelectionHandler$ChannelRegistryImpl.(SelectionHandler.scala:151)	at akka.io.SelectionHandler.(SelectionHandler.scala:234)	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:422)	at akka.util.Reflect$.instantiate(Reflect.scala:65)	at akka.actor.ArgsReflectConstructor.produce(Props.scala:348)	at akka.actor.Props.newActor(Props.scala:259)	at akka.actor.ActorCell.newActor(ActorCell.scala:561)	at akka.actor.ActorCell.create(ActorCell.scala:587)	at akka.actor.ActorCell.invokeAll$1(ActorCell.scala:460)	at akka.actor.ActorCell.systemInvoke(ActorCell.scala:482)	at akka.dispatch.Mailbox.processAllSystemMessages(Mailbox.scala:282)	at akka.dispatch.Mailbox.run(Mailbox.scala:223)	at akka.dispatch.Mailbox.exec(Mailbox.scala:234)	at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)	at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)	at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)	at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)