Strange exception "autowire.Error$InvalidInput" with no message

[nh13]

@lihaoyi I am trying to get autowire to work.

My url is http://0.0.0.0:8000/service/v1/dagr/api/DagrApi/query, body is

{
	"name" : "task"
}

and the stacktrace (server-site) is

[ERROR] [06/29/2017 10:49:41.513] [dagr-server-akka.actor.default-dispatcher-6] [akka.actor.ActorSystemImpl(dagr-server)] Error during processing of request: 'autowire.Error$InvalidInput (No error message supplied)'. Completing with 500 Internal Server Error response. To change default exception handling behavior, provide a custom ExceptionHandler.
autowire.Error$InvalidInput
	at autowire.Internal$.doValidate(Internal.scala:49)
	at dagr.webservice.DagrApiService$$anonfun$1.applyOrElse(DagrApiService.scala:120)
	at dagr.webservice.DagrApiService$$anonfun$1.applyOrElse(DagrApiService.scala:120)
	at scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:34)
	at dagr.webservice.DagrApiService.$anonfun$queryRoute$3(DagrApiService.scala:120)
	at akka.http.scaladsl.server.util.ApplyConverterInstances$$anon$1.$anonfun$apply$1(ApplyConverterInstances.scala:14)
	at akka.http.scaladsl.server.ConjunctionMagnet$$anon$2.$anonfun$apply$3(Directive.scala:162)
	at akka.http.scaladsl.server.directives.BasicDirectives.$anonfun$mapRouteResult$2(BasicDirectives.scala:61)
	at akka.http.scaladsl.server.directives.FutureDirectives.$anonfun$onComplete$3(FutureDirectives.scala:37)
	at akka.http.scaladsl.util.FastFuture$.$anonfun$transformWith$1(FastFuture.scala:37)
	at akka.http.scaladsl.util.FastFuture$.strictTransform$1(FastFuture.scala:41)
	at akka.http.scaladsl.util.FastFuture$.transformWith$extension1(FastFuture.scala:45)
	at akka.http.scaladsl.util.FastFuture$.transformWith$extension0(FastFuture.scala:37)
	at akka.http.scaladsl.server.directives.FutureDirectives.$anonfun$onComplete$2(FutureDirectives.scala:37)
	at akka.http.scaladsl.server.directives.BasicDirectives.$anonfun$textract$2(BasicDirectives.scala:154)
	at akka.http.scaladsl.server.directives.BasicDirectives.$anonfun$mapRouteResult$2(BasicDirectives.scala:61)
	at akka.http.scaladsl.server.directives.BasicDirectives.$anonfun$textract$2(BasicDirectives.scala:154)
	at akka.http.scaladsl.server.directives.BasicDirectives.$anonfun$mapRequestContext$2(BasicDirectives.scala:43)
	at akka.http.scaladsl.server.directives.BasicDirectives.$anonfun$textract$2(BasicDirectives.scala:154)
	at akka.http.scaladsl.server.RouteConcatenation$RouteWithConcatenation.$anonfun$$tilde$2(RouteConcatenation.scala:47)
	at akka.http.scaladsl.util.FastFuture$.strictTransform$1(FastFuture.scala:41)
	at akka.http.scaladsl.util.FastFuture$.transformWith$extension1(FastFuture.scala:45)
	at akka.http.scaladsl.util.FastFuture$.flatMap$extension(FastFuture.scala:26)
	at akka.http.scaladsl.server.RouteConcatenation$RouteWithConcatenation.$anonfun$$tilde$1(RouteConcatenation.scala:44)
	at akka.http.scaladsl.server.directives.ExecutionDirectives.$anonfun$handleExceptions$2(ExecutionDirectives.scala:32)
	at akka.http.scaladsl.server.directives.BasicDirectives.$anonfun$mapRouteResultWith$2(BasicDirectives.scala:67)
	at akka.http.scaladsl.server.directives.BasicDirectives.$anonfun$textract$2(BasicDirectives.scala:154)
	at akka.http.scaladsl.server.directives.BasicDirectives.$anonfun$mapRouteResult$2(BasicDirectives.scala:61)
	at akka.http.scaladsl.server.directives.BasicDirectives.$anonfun$textract$2(BasicDirectives.scala:154)
	at akka.http.scaladsl.server.directives.BasicDirectives.$anonfun$mapRouteResultWith$2(BasicDirectives.scala:67)
	at akka.http.scaladsl.server.directives.BasicDirectives.$anonfun$textract$2(BasicDirectives.scala:154)
	at akka.http.scaladsl.server.directives.ExecutionDirectives.$anonfun$handleExceptions$2(ExecutionDirectives.scala:32)
	at akka.http.scaladsl.server.Route$.$anonfun$asyncHandler$1(Route.scala:79)
	at akka.stream.impl.fusing.MapAsync$$anon$24.onPush(Ops.scala:1169)
	at akka.stream.impl.fusing.GraphInterpreter.processPush(GraphInterpreter.scala:747)
	at akka.stream.impl.fusing.GraphInterpreter.processEvent(GraphInterpreter.scala:710)
	at akka.stream.impl.fusing.GraphInterpreter.execute(GraphInterpreter.scala:616)
	at akka.stream.impl.fusing.GraphInterpreterShell.runBatch(ActorGraphInterpreter.scala:471)
	at akka.stream.impl.fusing.GraphInterpreterShell.receive(ActorGraphInterpreter.scala:423)
	at akka.stream.impl.fusing.ActorGraphInterpreter.akka$stream$impl$fusing$ActorGraphInterpreter$$processEvent(ActorGraphInterpreter.scala:603)
	at akka.stream.impl.fusing.ActorGraphInterpreter$$anonfun$receive$1.applyOrElse(ActorGraphInterpreter.scala:618)
	at akka.actor.Actor.aroundReceive(Actor.scala:502)
	at akka.actor.Actor.aroundReceive$(Actor.scala:500)
	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 java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

Branch (if you want to check out): https://github.com/fulcrumgenomics/dagr/tree/nh_akka_http

Command:
java -Xmx8G -jar dagr/webservice/target/scala-2.12/dagr-webservice-0.2.1-SNAPSHOT.jar --webservice true --host 0.0.0.0 --port 8000 SleepyPipeline -j -n 10 -s 42