java.lang.IllegalStateException：未定义的设置'eclipseSkipProject

Question

在迁移我的项目Play 2.4和sbt eclipse插件4.0.0时，我的构建文件中出现以下异常：

java.lang.IllegalStateException: Undefined setting 'eclipseSkipProject in Scope(
Select(ProjectRef("Some git url with #commit",root)),This,This,This)'!

这跟随this issue，因为我只想通过在每个子项目中添加sbteclipse 4.0.0插件来修改原始的缓存子项目，从而获得更好的解决方法。

我的build.sbt文件如下：

lazy val server = (project in file("server"))
   .settings(scalaVersion := "2.11.7")
  .dependsOn(leonProject)

lazy val leonProject = RootProject(uri("https://github.com/epfl-lara/leon.git#5bf8a57cc03ae5ccbd890e3f4f0121a6f9dd1bb2"))

EclipseKeys.skipProject in leonProject := true

EclipseKeys.preTasks := Seq(compile in Compile)

和project/plugins.sbt为sbt版本0.13.9

resolvers += "Typesafe Releases" at "http://repo.typesafe.com/typesafe/releases/"

addSbtPlugin("com.typesafe.sbteclipse" % "sbteclipse-plugin" % "4.0.0")

Eclipse.skipProject in leonProject := true怎么没有效果？