trying to catch 404s

error.txt

devin@debian:~/projects/blaster$ activator test
[info] Loading project definition from /home/devin/projects/blaster/project
[info] Set current project to blaster (in build file:/home/devin/projects/blaster/)
[info] Compiling 1 Scala source to /home/devin/projects/blaster/target/scala-2.11/classes...
[error] /home/devin/projects/blaster/app/clients/Stash.scala:119: type mismatch;
[error]  found   : Unit
[error]  required: scala.concurrent.Future[play.api.libs.json.JsValue]
[error]   }
[error]   ^
[error] one error found
[error] (compile:compileIncremental) Compilation failed
[error] Total time: 5 s, completed Jul 15, 2015 6:58:58 PM

Stash.scala

def callApi(url:String): Future[JsValue] = {
    implicit val context = play.api.libs.concurrent.Execution.Implicits.defaultContext
    val urlWithParams = url + "?" + pageSizeParam
    val request: WSRequest = ws.url(urlWithParams)
    val response = request.withHeaders(
      "Accept" -> "application/json",
      "Authorization" -> "Basic .....")
      .get().map { response =>
        if (response.status == 200) {
           response.json
        } else {
          Json.obj("error" -> response.status )
       }
    }
  }