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java.lang.NullPointerException at io.gatling.core.akka.BaseActor.system(BaseActor.scala:25) at io.gatling.metrics.sender.TcpSender.askForConnection(TcpSender.scala:99) at io.gatling.metrics.sender.TcpSender$$anonfun$3.io$gatling$metrics$sender$TcpSender$$anonfun$3$$$anonfun$1(TcpSender.scala:54) at io.gatling.metrics.sender.TcpSender$$nestedInAnonfun$3$lambda$$applyOrElse$1.apply(TcpSender.scala:54) at io.gatling.metrics.sender.TcpSender$$nestedInAnonfun$3$lambda$$applyOrElse$1.apply(TcpSender.scala:54) at scala.Function0$class.apply$mcV$sp(Function0.scala:34) at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12) at akka.actor.Scheduler$$anon$4.run(Scheduler.scala:126) at akka.actor.LightArrayRevolverScheduler$TaskHolder.run(LightArrayRevolverScheduler.scala:340) at akka.actor.LightArrayRevolverScheduler$$anonfun$close$1.apply(LightArrayRevolverScheduler.scala:144) at akka.actor.LightArrayRevolverScheduler$$anonfun$close$1.apply(LightArrayRevolverScheduler.scala:143) at scala.collection.Iterator$class.foreach(Iterator.scala:893) at scala.collection.AbstractIterator.foreach(Iterator.scala:1336) at scala.collection.IterableLike$class.foreach(IterableLike.scala:72) at scala.collection.AbstractIterable.foreach(Iterable.scala:54) at akka.actor.LightArrayRevolverScheduler.close(LightArrayRevolverScheduler.scala:142) at akka.actor.ActorSystemImpl.stopScheduler(ActorSystem.scala:712) at akka.actor.ActorSystemImpl$$anonfun$liftedTree2$1$1.apply$mcV$sp(ActorSystem.scala:646) at akka.actor.ActorSystemImpl$$anonfun$liftedTree2$1$1.apply(ActorSystem.scala:646) at akka.actor.ActorSystemImpl$$anonfun$liftedTree2$1$1.apply(ActorSystem.scala:646) at akka.actor.ActorSystemImpl$$anon$3.run(ActorSystem.scala:662) at akka.actor.ActorSystemImpl$TerminationCallbacks$$anonfun$addRec$1$1.applyOrElse(ActorSystem.scala:840) at akka.actor.ActorSystemImpl$TerminationCallbacks$$anonfun$addRec$1$1.applyOrElse(ActorSystem.scala:840) at scala.concurrent.Future$$anonfun$andThen$1.apply(Future.scala:436) at scala.concurrent.Future$$anonfun$andThen$1.apply(Future.scala:435) at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32) at akka.dispatch.BatchingExecutor$AbstractBatch.processBatch(BatchingExecutor.scala:55) at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply$mcV$sp(BatchingExecutor.scala:91) at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91) at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91) at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:72) at akka.dispatch.BatchingExecutor$BlockableBatch.run(BatchingExecutor.scala:90) at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:39) at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:409) 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)