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

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    • java.lang.IllegalArgumentException: requirement failed: Cannot push port (Balance.out8) twice at scala.Predef$.require(Predef.scala:219) at at$$anon$17.akka$stream$scaladsl$Balance$$anon$$dequeueAndDispatch(Graph.scala:613) at$$anon$17$$anon$18.onPush(Graph.scala:618) at$1(GraphInterpreter.scala:590) at at at at at$stream$impl$fusing$ActorGraphInterpreter$$processEvent(ActorGraphInterpreter.scala:603) at$$anonfun$receive$1.applyOrElse(ActorGraphInterpreter.scala:618) at$class.aroundReceive(Actor.scala:484) at at at at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257) at at akka.dispatch.Mailbox.exec(Mailbox.scala:234) at scala.concurrent.forkjoin.ForkJoinTask.doExec( at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask( at scala.concurrent.forkjoin.ForkJoinPool.runWorker( at

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