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not yet initialized: only setHandler is allowed in GraphStageLogic constructor
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not yet initialized: only setHandler is allowed in GraphStageLogic constructor
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not yet initialized: only setHandler is allowed in GraphStageLogic constructor
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not yet initialized: only setHandler is allowed in GraphStageLogic constructor
java.lang.IllegalStateException: not yet initialized: only setHandler is allowed in GraphStageLogic constructor	at akka.stream.stage.GraphStageLogic.interpreter(GraphStage.scala:242)	at akka.stream.stage.GraphStageLogic$$anon$2.invoke(GraphStage.scala:885)	at akka.stream.impl.io.OutputStreamSourceStage$$anon$1.wakeUp(OutputStreamSourceStage.scala:73)	at akka.stream.impl.io.OutputStreamSourceStage$$anonfun$createLogicAndMaterializedValue$2.apply(OutputStreamSourceStage.scala:154)	at akka.stream.impl.io.OutputStreamSourceStage$$anonfun$createLogicAndMaterializedValue$2.apply(OutputStreamSourceStage.scala:154)	at akka.stream.impl.io.OutputStreamAdapter$$anonfun$sendMessage$1.apply$mcV$sp(OutputStreamSourceStage.scala:193)	at akka.stream.impl.io.OutputStreamAdapter.send(OutputStreamSourceStage.scala:172)	at akka.stream.impl.io.OutputStreamAdapter.sendMessage(OutputStreamSourceStage.scala:191)	at akka.stream.impl.io.OutputStreamAdapter.flush(OutputStreamSourceStage.scala:215)	at akka.stream.io.OutputStreamSourceSpec$$anonfun$2$$anonfun$apply$mcV$sp$4$$anonfun$apply$4$$anonfun$10.apply(OutputStreamSourceSpec.scala:72)	at akka.stream.io.OutputStreamSourceSpec$$anonfun$2$$anonfun$apply$mcV$sp$4$$anonfun$apply$4$$anonfun$10.apply(OutputStreamSourceSpec.scala:68)	at akka.stream.impl.MaterializerSession.resolveMaterialized(StreamLayout.scala:959)	at akka.stream.impl.MaterializerSession.resolveMaterialized(StreamLayout.scala:958)	at akka.stream.impl.MaterializerSession.materializeModule(StreamLayout.scala:936)	at akka.stream.impl.MaterializerSession.materialize(StreamLayout.scala:882)	at akka.stream.impl.ActorMaterializerImpl.materialize(ActorMaterializerImpl.scala:240)	at akka.stream.impl.ActorMaterializerImpl.materialize(ActorMaterializerImpl.scala:138)	at akka.stream.scaladsl.RunnableGraph.run(Flow.scala:350)	at akka.stream.scaladsl.Source.runWith(Source.scala:81)	at akka.stream.scaladsl.Source.runReduce(Source.scala:117)	at akka.stream.io.OutputStreamSourceSpec$$anonfun$2$$anonfun$apply$mcV$sp$4$$anonfun$apply$4.apply(OutputStreamSourceSpec.scala:76)	at akka.stream.io.OutputStreamSourceSpec$$anonfun$2$$anonfun$apply$mcV$sp$4$$anonfun$apply$4.apply(OutputStreamSourceSpec.scala:67)	at akka.stream.testkit.Utils$.assertAllStagesStopped(Utils.scala:25)	at akka.stream.io.OutputStreamSourceSpec$$anonfun$2$$anonfun$apply$mcV$sp$4.apply(OutputStreamSourceSpec.scala:67)	at akka.stream.io.OutputStreamSourceSpec$$anonfun$2$$anonfun$apply$mcV$sp$4.apply(OutputStreamSourceSpec.scala:67)	at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85)