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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$4.run(Scheduler.scala:126)	at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:39)	at akka.dispatch.ForkJoinExecutorConfigurator$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)