Добавить lift-json в качестве зависимости сборки для проекта Play 2.0

Я новичок в Scala и SBT, и я пытаюсь понять, как добавить lift-json в качестве зависимости сборки в мой проект Play 2.0. В документации по lift-json сказано:

Add dependency to your project description:
val lift_json = "net.liftweb" %% "lift-json" % "XXX"

Я не уверен даже, где на самом деле хранится "описание проекта", но я нашел Build.scala, в котором есть следующее:

import sbt._
import Keys._
import PlayProject._

object ApplicationBuild extends Build {

    val appName         = "test"
    val appVersion      = "1.0"

    val appDependencies = Seq(
      // Add your project dependencies here,
      "net.liftweb" %% "lift-json" % "2.9.1"
    )

    val main = PlayProject(appName, appVersion, appDependencies).settings(defaultScalaSettings:_*).settings(
      // Add your own project settings here      
    )

}

Вы можете видеть строку, которую я добавил для net.liftweb. К сожалению, похоже, это не то место или не то содержимое, потому что я получаю следующую ошибку сборки:

[info] Updating {file:/D:/play/test/}test...
[warn]  module not found: net.liftweb#lift-json_2.9.1;2.9.1
[warn] ==== local: tried
[warn]   D:\play\play-2.0-beta\framework\..\repository/local/net.liftweb/lift-json_2.9.1/2.9.1/ivys/ivy.xml
[warn]   -- artifact net.liftweb#lift-json_2.9.1;2.9.1!lift-json_2.9.1.jar:
[warn]   D:\play\play-2.0-beta\framework\..\repository/local/net.liftweb/lift-json_2.9.1/2.9.1/jars/lift-json_2.9.1.jar
[warn] ==== Play Repository: tried
[warn]   http://download.playframework.org/ivy-releases/net.liftweb/lift-json_2.9.1/2.9.1/ivys/ivy.xml
[warn]   -- artifact net.liftweb#lift-json_2.9.1;2.9.1!lift-json_2.9.1.jar:
[warn]   http://download.playframework.org/ivy-releases/net.liftweb/lift-json_2.9.1/2.9.1/jars/lift-json_2.9.1.jar
[warn] ==== Typesafe Repository: tried
[warn]   http://repo.typesafe.com/typesafe/releases/net/liftweb/lift-json_2.9.1/2.9.1/lift-json_2.9.1-2.9.1.pom
[warn]   -- artifact net.liftweb#lift-json_2.9.1;2.9.1!lift-json_2.9.1.jar:
[warn]   http://repo.typesafe.com/typesafe/releases/net/liftweb/lift-json_2.9.1/2.9.1/lift-json_2.9.1-2.9.1.jar
[warn] ==== public: tried
[warn]   http://repo1.maven.org/maven2/net/liftweb/lift-json_2.9.1/2.9.1/lift-json_2.9.1-2.9.1.pom
[warn]   -- artifact net.liftweb#lift-json_2.9.1;2.9.1!lift-json_2.9.1.jar:
[warn]   http://repo1.maven.org/maven2/net/liftweb/lift-json_2.9.1/2.9.1/lift-json_2.9.1-2.9.1.jar
[warn] ==== Scala-Tools Maven2 Repository: tried
[warn]   http://scala-tools.org/repo-releases/net/liftweb/lift-json_2.9.1/2.9.1/lift-json_2.9.1-2.9.1.pom
[warn]   -- artifact net.liftweb#lift-json_2.9.1;2.9.1!lift-json_2.9.1.jar:
[warn]   http://scala-tools.org/repo-releases/net/liftweb/lift-json_2.9.1/2.9.1/lift-json_2.9.1-2.9.1.jar
[warn]  ::::::::::::::::::::::::::::::::::::::::::::::
[warn]  ::          UNRESOLVED DEPENDENCIES         ::
[warn]  ::::::::::::::::::::::::::::::::::::::::::::::
[warn]  :: net.liftweb#lift-json_2.9.1;2.9.1: not found
[warn]  ::::::::::::::::::::::::::::::::::::::::::::::
[error] {file:/D:/play/test/}test/*:update: sbt.ResolveException: unresolved dependency: net.liftweb#lift-json_2.9.1;2.9
.1: not found
[error] application -

! @68mcpckf2 - Internal server error, for request [GET /] ->

play.api.UnexpectedException: Unexpected exception [ResolveException: unresolved dependency: net.liftweb#lift-json_2.9.1
;2.9.1: not found]
        at sbt.PlayProject$$anon$1$$anonfun$reload$1$$anonfun$apply$36.apply(SbtPlugin.scala:518) ~[play_2.9.1.jar:na]
        at sbt.PlayProject$$anon$1$$anonfun$reload$1$$anonfun$apply$36.apply(SbtPlugin.scala:511) ~[play_2.9.1.jar:na]
        at scala.Option.map(Option.scala:133) [scala-library.jar:na]
        at sbt.PlayProject$$anon$1$$anonfun$reload$1.apply(SbtPlugin.scala:511) ~[play_2.9.1.jar:na]
        at sbt.PlayProject$$anon$1$$anonfun$reload$1.apply(SbtPlugin.scala:510) ~[play_2.9.1.jar:na]
        at scala.Either$LeftProjection.map(Either.scala:183) ~[scala-library.jar:na]
Caused by: sbt.ResolveException: unresolved dependency: net.liftweb#lift-json_2.9.1;2.9.1: not found
        at sbt.IvyActions$.sbt$IvyActions$$resolve(IvyActions.scala:216) ~[ivy_2.9.1-0.11.0.jar:na]
        at sbt.IvyActions$$anonfun$update$1.apply(IvyActions.scala:130) ~[ivy_2.9.1-0.11.0.jar:na]
        at sbt.IvyActions$$anonfun$update$1.apply(IvyActions.scala:129) ~[ivy_2.9.1-0.11.0.jar:na]
        at sbt.IvySbt$Module$$anonfun$withModule$1.apply(Ivy.scala:110) ~[ivy_2.9.1-0.11.0.jar:na]
        at sbt.IvySbt$Module$$anonfun$withModule$1.apply(Ivy.scala:110) ~[ivy_2.9.1-0.11.0.jar:na]
        at sbt.IvySbt$$anonfun$withIvy$1.apply(Ivy.scala:98) ~[ivy_2.9.1-0.11.0.jar:na]

У меня есть копия исходного кода Lift, но я не знаю, куда ее поместить. И я почти уверен, что поместил эту зависимость в неправильное место. Не мог бы кто-нибудь указать мне правильное направление?