Sbt：为什么需要scala-lang 2.10.3？

import android.Keys._

android.Plugin.androidBuild

name := "teacher-journal"

scalaVersion := "2.11.0"

proguardCache in Android ++= Seq(
    ProguardCache("org.scaloid") % "org.scaloid"
)

proguardOptions in Android ++= Seq("-dontobfuscate","-dontoptimize","-dontwarn scala.collection.mutable.**")

libraryDependencies += "org.scaloid" %% "scaloid" % "3.3-8"

scalacOptions in Compile += "-feature"

run <<= run in Android

install <<= install in Android

它给了我一个错误：

[warn]  ::::::::::::::::::::::::::::::::::::::::::::::
[warn]  ::          UNRESOLVED DEPENDENCIES         ::
[warn]  ::::::::::::::::::::::::::::::::::::::::::::::
[warn]  :: org.scala-lang#scala-library;2.10.3: configuration not found in org.scala-lang#scala-library;2.10.3: 'compile'. It was required from default#teacher-journal-build;0.1-SNAPSHOT provided
[warn]  ::::::::::::::::::::::::::::::::::::::::::::::
sbt.ResolveException: unresolved dependency: org.scala-lang#scala-library;2.10.3: configuration not found in org.scala-lang#scala-library;2.10.3: 'compile'. It was required from default#teacher-journal-build;0.1-SNAPSHOT provided

Sbt 0.13.2,系统scala 2.10.2,java 8,fedora 20.为什么需要scala 2.10.3以及如何修复错误？

一切都适用于在Ubuntu上具有类似配置的朋友.