NPE when application start with multiples Actor Systems

[dpsoft]

[ERROR][threads-redis-client-akka.actor.default-dispatcher-5] [akka://threads-redis-client/system/IO-TCP/selectors] null
akka.actor.ActorInitializationException: exception during creation
at akka.actor.ActorInitializationException$.apply(Actor.scala:164)
at akka.actor.ActorCell.create(ActorCell.scala:596)
at akka.actor.ActorCell.invokeAll$1_aroundBody2(ActorCell.scala:456)
at akka.actor.ActorCell$AjcClosure3.run(ActorCell.scala:1)
at org.aspectj.runtime.reflect.JoinPointImpl.proceed(JoinPointImpl.java:149)
at akka.instrumentation.ActorSystemMessagePassingTracing$$anonfun$aroundSystemMessageInvoke$1.apply(ActorSystemMessagePassingTracing.scala:61)
at kamon.trace.TraceRecorder$.withTraceContext(TraceRecorder.scala:66)
at akka.instrumentation.ActorSystemMessagePassingTracing.aroundSystemMessageInvoke(ActorSystemMessagePassingTracing.scala:61)
at akka.actor.ActorCell.invokeAll$1(ActorCell.scala:1)
at akka.actor.ActorCell.systemInvoke(ActorCell.scala:478)
at akka.dispatch.Mailbox.processAllSystemMessages(Mailbox.scala:263)
at akka.dispatch.Mailbox.run(Mailbox.scala:219)
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:393)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at akka.util.Reflect$.instantiate(Reflect.scala:66)
at akka.actor.ArgsReflectConstructor.produce(Props.scala:349)
at akka.actor.Props.newActor(Props.scala:249)
at akka.actor.ActorCell.newActor(ActorCell.scala:552)
at akka.actor.ActorCell.create(ActorCell.scala:578)
... 15 more
Caused by: java.lang.NullPointerException
at akka.actor.ActorSystemImpl.findExtension(ActorSystem.scala:697)
at akka.actor.ActorSystemImpl.registerExtension(ActorSystem.scala:706)
at akka.actor.ExtensionId$class.apply(Extension.scala:79)
at kamon.metrics.Metrics$.apply(MetricsExtension.scala:97)
at kamon.Kamon$.apply(Kamon.scala:31)
at akka.instrumentation.DispatcherTracing.afterDispatcherStartup(DispatcherTracing.scala:55)
at akka.dispatch.Dispatcher$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:145)
at akka.dispatch.BatchingExecutor$class.execute(BatchingExecutor.scala:113)
...