Was ist erforderlich, um sbt build mit Akka?

Ich bin versucht, die scala akka von sbt.

Meine sbt-Datei sieht wie folgt aus:

name := "hello"

version := "1.0"

scalaVersion := "2.9.1"

resolvers += "akka" at "http://repo.akka.io/snapshots"

libraryDependencies ++= Seq(
  "com.codahale"      % "simplespec_2.9.0-1" % "0.4.1",
  "com.typesafe.akka" % "akka-stm"           % "2.0-SNAPSHOT" 
)

mein code:

import akka._

object HelloWorld {
  def main(args: Array[String]) {
    println("Hello, world!")
  }
}

Wenn ich sbt compile bekomme ich

]# **sbt compile**
[info] Set current project to default-91c48b (in build file:/var/storage1/home/test_user/dev_scala/hello/)
[info] Compiling 1 Scala source to /var/storage1/home/test_user/dev_scala/hello/target/scala-2.9.2/classes...
[error] /var/storage1/home/test_user/dev_scala/hello/src/main/scala/hw.scala:3: not found: object akka
[error] import akka._
[error]        ^
[error] one error found
[error] (compile:compile) Compilation failed
[error] Total time: 3 s, completed May 22, 2013 8:59:08 PM

Bitte um Rat.

EDIT2:
basierend auf den Kommentaren unten. hier ist der neue sbt-Datei

name := "hello"
version := "1.0"
scalaVersion := "2.9.1"

resolvers += "akka" at "http://repo.akka.io/snapshots"

libraryDependencies ++= Seq(
"com.typesafe.akka" %% "akka-actor" % "2.1.4",
  "com.codahale" % "simplespec_2.9.0-1" % "0.4.1",
  "com.typesafe.akka" % "akka-stm" % "2.0-SNAPSHOT" ,
  "com.typesafe.akka" %% "akka-actor"    % "2.2-M3",
"com.typesafe.akka" %% "akka-slf4j"    % "2.2-M3",
"com.typesafe.akka" %% "akka-remote"   % "2.2-M3",
"com.typesafe.akka" %% "akka-testkit"  % "2.2-M3"% "test"
)

irgendwelche Ideen ?

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