activator new sampleapp play-scala で作ったプロジェクトを IntelliJで sbt run すると 「object index is not a member of package views.html」エラー

activator new sampleapp play-scala で作ったプロジェクトを IntelliJで sbt run すると 「object index is not a member of package views.html」エラー

 - Compilation completed with 1 error and 0 warnings in 4s 912ms
sampleapp/app/controllers/HomeController.scala
Error:(21, 19) object index is not a member of package views.html
    Ok(views.html.index("Your new application is ready."))

ファイル

controllers.HomeController

package controllers

import javax.inject._
import play.api._
import play.api.mvc._

/**
 * This controller creates an `Action` to handle HTTP requests to the
 * application's home page.
 */
@Singleton
class HomeController @Inject() extends Controller {

  /**
   * Create an Action to render an HTML page with a welcome message.
   * The configuration in the `routes` file means that this method
   * will be called when the application receives a `GET` request with
   * a path of `/`.
   */
  def index = Action {
    Ok(views.html.index("Your new application is ready."))
  }

}

対処

コマンドラインで sbt run してからなら通った。 タスクの作り方が悪かったんだろうか . .