我尝试将传入的Source[ByteString，Any]广播到2个不同的流，然后扇入（zip）输出。但是，我得到错误“重载方法~>与替代品”。

val byteStringSource: Source[ByteString, Any] = Source.fromIterator(() => (1 to 10).map(i => ByteString(s"Element $i")).iterator)

  val incrementer = Flow[String].map{ x =>
    x
  }
  val multiplier = Flow[String].map{ x =>
    x
  }

  val output = Sink.foreach[(Type1, Type2)] { n1 =>
    println(s"First obj is ${(n1._1.toString)} & second obj is ${n1._2.toString}")
  }

  val graph = RunnableGraph.fromGraph(
    GraphDSL.create() {implicit builder: GraphDSL.Builder[NotUsed] =>
      import GraphDSL.Implicits._

      val broadcast = builder.add(Broadcast[String](2))
      val zip = builder.add(Zip[Type1, Type2])//fan-in operator

      byteStringSource ~> broadcast
      broadcast.out(0) ~> incrementer ~> zip.in0
      broadcast.out(1) ~> multiplier ~> zip.in1

      zip.out ~> output
      ClosedShape
    }
  )
  graph.run()

我该如何解决这个问题？