HI,

I copy the code example from introduction of akka-http 
(http://doc.akka.io/docs/akka/2.4/scala/http/introduction.html)
I manage the project by maven, and the pom.xml is 

<dependencies>
    <dependency>
        <groupId>com.typesafe.play</groupId>
        <artifactId>twirl-api_2.11</artifactId>
        <version>1.1.1</version>
    </dependency>
    <dependency>
        <groupId>com.typesafe.akka</groupId>
        <artifactId>akka-http-experimental_2.11</artifactId>
        <version>2.4.11</version>
    </dependency>
</dependencies>

and some plugins for scala and twirl are ignored.
The code is as follows

import akka.actor.ActorSystem
import akka.http.scaladsl.Http
import akka.http.scaladsl.model._
import akka.http.scaladsl.server.Directives._
import akka.stream.ActorMaterializer

import scala.io.StdIn


object Main{
  def main(args : Array[String]): Unit ={
    implicit val system = ActorSystem("my-system")
    implicit val materializer = ActorMaterializer()
    // needed for the future flatMap/onComplete in the end
    implicit val ec = system.dispatcher
    val RESOURCE_DIR = "spark/deploy/master/webui"
    val STATIC_RESOURCE_DIR = "spark/deploy/static"
    val route =
      path("world"){
        get{
          *complete(HttpEntity(ContentTypes.`text/html(UTF-8)`, 
html.Hello.render("Jake").toString()))*
        }
      } ~
      path("hello") {
        get {
          *complete(HttpEntity(ContentTypes.`text/html(UTF-8)`, 
html.Hello.render("Jake").toString()))*
        }~
          pathPrefix("static") {
            getFromResourceDirectory(STATIC_RESOURCE_DIR)
          } ~
          getFromResourceDirectory(RESOURCE_DIR)
      }
    val bindingFuture = Http().bindAndHandle(route, "localhost", 8080)

    println(s"Server online at http://localhost:8080";)
    StdIn.readLine() // let it run until user presses return
  }
}


But, some error hints appear in my intellj idea

Type mismatch, expected: ToResponseMarshallable, actual: HttpEntity.Strict
for 

*complete(HttpEntity(ContentTypes.`text/html(UTF-8)`, 
html.Hello.render("Jake").toString()))*


However, I can run this webservice without any error.

I also try to cast HttpEntity to ToResponseMarshallable, but the conversion 
is forbidden

What shall I do to clear the error hint in intellj idea?

Thanks in advance.















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