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via Google Groups by Scott Lunel, 1 year ago
akka.stream.ActorMaterializer$.downcast(Lakka/stream/Materializer;)Lakka/stream/ActorMaterializer;
java.lang.NoSuchMethodError: 
akka.stream.ActorMaterializer$.downcast(Lakka/stream/Materializer;)Lakka/stream/ActorMaterializer;	at akka.http.scaladsl.unmarshalling.MultipartUnmarshallers$$anonfun$multipartUnmarshaller$1$$anonfun$apply$1$$anonfun$apply$2$$anonfun$2.apply(MultipartUnmarshallers.scala:78)	at akka.http.scaladsl.unmarshalling.MultipartUnmarshallers$$anonfun$multipartUnmarshaller$1$$anonfun$apply$1$$anonfun$apply$2$$anonfun$2.apply(MultipartUnmarshallers.scala:78)	at scala.Option.getOrElse(Option.scala:121)	at akka.http.scaladsl.unmarshalling.MultipartUnmarshallers$$anonfun$multipartUnmarshaller$1$$anonfun$apply$1$$anonfun$apply$2.apply(MultipartUnmarshallers.scala:78)	at akka.http.scaladsl.unmarshalling.MultipartUnmarshallers$$anonfun$multipartUnmarshaller$1$$anonfun$apply$1$$anonfun$apply$2.apply(MultipartUnmarshallers.scala:71)	at akka.http.scaladsl.unmarshalling.Unmarshaller$$anon$1.apply(Unmarshaller.scala:52)	at akka.http.scaladsl.unmarshalling.LowerPriorityGenericUnmarshallers$$anonfun$messageUnmarshallerFromEntityUnmarshaller$1$$anonfun$apply$1$$anonfun$apply$2.apply(GenericUnmarshallers.scala:20)	at akka.http.scaladsl.unmarshalling.LowerPriorityGenericUnmarshallers$$anonfun$messageUnmarshallerFromEntityUnmarshaller$1$$anonfun$apply$1$$anonfun$apply$2.apply(GenericUnmarshallers.scala:20)	at akka.http.scaladsl.unmarshalling.Unmarshaller$$anon$1.apply(Unmarshaller.scala:52)