java.lang.IllegalArgumentException

requirement failed: Cannot push port (Balance.out8) twice

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  • Stack trace

    • java.lang.IllegalArgumentException: requirement failed: Cannot push port (Balance.out8) twice at scala.Predef$.require(Predef.scala:219) at akka.stream.stage.GraphStageLogic.push(GraphStage.scala:436) at akka.stream.scaladsl.Balance$$anon$17.akka$stream$scaladsl$Balance$$anon$$dequeueAndDispatch(Graph.scala:613) at akka.stream.scaladsl.Balance$$anon$17$$anon$18.onPush(Graph.scala:618) at akka.stream.impl.fusing.GraphInterpreter.processElement$1(GraphInterpreter.scala:590) at akka.stream.impl.fusing.GraphInterpreter.processEvent(GraphInterpreter.scala:601) at akka.stream.impl.fusing.GraphInterpreter.execute(GraphInterpreter.scala:542) at akka.stream.impl.fusing.GraphInterpreterShell.runBatch(ActorGraphInterpreter.scala:471) at akka.stream.impl.fusing.GraphInterpreterShell.receive(ActorGraphInterpreter.scala:410) at akka.stream.impl.fusing.ActorGraphInterpreter.akka$stream$impl$fusing$ActorGraphInterpreter$$processEvent(ActorGraphInterpreter.scala:603) at akka.stream.impl.fusing.ActorGraphInterpreter$$anonfun$receive$1.applyOrElse(ActorGraphInterpreter.scala:618) at akka.actor.Actor$class.aroundReceive(Actor.scala:484) at akka.stream.impl.fusing.ActorGraphInterpreter.aroundReceive(ActorGraphInterpreter.scala:529) at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526) at akka.actor.ActorCell.invoke(ActorCell.scala:495) at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257) at akka.dispatch.Mailbox.run(Mailbox.scala:224) 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)

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