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via GitHub by ktoso
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no handler defined in stage akka.http.impl.engine.http2.Http2ServerDemux$$anon$1@3d24940f for port Demux.substreamIn
java.lang.IllegalStateException: no handler defined in stage akka.http.impl.engine.http2.Http2ServerDemux$$anon$1@3d24940f for port Demux.substreamIn	at akka.stream.impl.fusing.GraphInterpreter$GraphAssembly.materialize(GraphInterpreter.scala:214)	at akka.stream.impl.ActorMaterializerImpl$$anon$2.matGraph(ActorMaterializerImpl.scala:214)	at akka.stream.impl.ActorMaterializerImpl$$anon$2.materializeAtomic(ActorMaterializerImpl.scala:201)	at akka.stream.impl.MaterializerSession$$anonfun$materializeModule$1.apply(StreamLayout.scala:919)	at akka.stream.impl.MaterializerSession$$anonfun$materializeModule$1.apply(StreamLayout.scala:915)	at scala.collection.immutable.Set$Set2.foreach(Set.scala:128)	at akka.stream.impl.MaterializerSession.materializeModule(StreamLayout.scala:915)	at akka.stream.impl.MaterializerSession.materialize(StreamLayout.scala:882)	at akka.stream.impl.ActorMaterializerImpl.materialize(ActorMaterializerImpl.scala:240)	at akka.stream.impl.ActorMaterializerImpl.materialize(ActorMaterializerImpl.scala:138)	at akka.stream.scaladsl.RunnableGraph.run(Flow.scala:350)	at akka.http.scaladsl.Http2Ext$$anonfun$bindAndHandleAsync$1.apply(Http2.scala:92)	at akka.http.scaladsl.Http2Ext$$anonfun$bindAndHandleAsync$1.apply(Http2.scala:84)	at akka.stream.impl.fusing.MapAsyncUnordered$$anon$22.onPush(Ops.scala:1082)	at akka.stream.impl.fusing.GraphInterpreter.processPush(GraphInterpreter.scala:747)	at akka.stream.impl.fusing.GraphInterpreter.processEvent(GraphInterpreter.scala:710)	at akka.stream.impl.fusing.GraphInterpreter.execute(GraphInterpreter.scala:616)	at akka.stream.impl.fusing.GraphInterpreterShell.runBatch(ActorGraphInterpreter.scala:471)	at akka.stream.impl.fusing.GraphInterpreterShell.receive(ActorGraphInterpreter.scala:423)	at akka.stream.impl.fusing.ActorGraphInterpreter.akka$stream$impl$fusing$ActorGraphInterpreter$$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)