Unresolved dependency on sbt-android-plugin 0.6.0-SNAPSHOT?

I just followed the steps at Build Scala Android apps using Scala and when I ran sbt inside the project folder I got the following unresolved dependency error:

[info] Loading project definition from /Users/macarse/Documents/scalatest/project/plugins
[info] Updating {file:/Users/macarse/Documents/scalatest/project/plugins/}default-dd299a...
[warn]  module not found: org.scala-tools.sbt#sbt-android-plugin_2.9.1;0.6.0-SNAPSHOT
[warn] ==== typesafe-ivy-releases: tried
[warn]   http://repo.typesafe.com/typesafe/ivy-releases/org.scala-tools.sbt/sbt-android-plugin_2.9.1/0.6.0-SNAPSHOT/ivys/ivy.xml
[warn]   -- artifact org.scala-tools.sbt#sbt-android-plugin_2.9.1;0.6.0-SNAPSHOT!sbt-android-plugin_2.9.1.jar:
[warn]   http://repo.typesafe.com/typesafe/ivy-releases/org.scala-tools.sbt/sbt-android-plugin_2.9.1/0.6.0-SNAPSHOT/jars/sbt-android-plugin_2.9.1.jar
[warn] ==== local: tried
[warn]   /Users/macarse/.ivy2/local/org.scala-tools.sbt/sbt-android-plugin_2.9.1/0.6.0-SNAPSHOT/ivys/ivy.xml
[warn]   -- artifact org.scala-tools.sbt#sbt-android-plugin_2.9.1;0.6.0-SNAPSHOT!sbt-android-plugin_2.9.1.jar:
[warn]   /Users/macarse/.ivy2/local/org.scala-tools.sbt/sbt-android-plugin_2.9.1/0.6.0-SNAPSHOT/jars/sbt-android-plugin_2.9.1.jar
[warn] ==== public: tried
[warn]   http://repo1.maven.org/maven2/org/scala-tools/sbt/sbt-android-plugin_2.9.1/0.6.0-SNAPSHOT/sbt-android-plugin_2.9.1-0.6.0-SNAPSHOT.pom
[warn]   -- artifact org.scala-tools.sbt#sbt-android-plugin_2.9.1;0.6.0-SNAPSHOT!sbt-android-plugin_2.9.1.jar:
[warn]   http开发者_Go百科://repo1.maven.org/maven2/org/scala-tools/sbt/sbt-android-plugin_2.9.1/0.6.0-SNAPSHOT/sbt-android-plugin_2.9.1-0.6.0-SNAPSHOT.jar
[warn] ==== Scala-Tools Maven2 Repository: tried
[warn]   http://scala-tools.org/repo-releases/org/scala-tools/sbt/sbt-android-plugin_2.9.1/0.6.0-SNAPSHOT/sbt-android-plugin_2.9.1-0.6.0-SNAPSHOT.pom
[warn]   -- artifact org.scala-tools.sbt#sbt-android-plugin_2.9.1;0.6.0-SNAPSHOT!sbt-android-plugin_2.9.1.jar:
[warn]   http://scala-tools.org/repo-releases/org/scala-tools/sbt/sbt-android-plugin_2.9.1/0.6.0-SNAPSHOT/sbt-android-plugin_2.9.1-0.6.0-SNAPSHOT.jar
[warn]  ::::::::::::::::::::::::::::::::::::::::::::::
[warn]  ::          UNRESOLVED DEPENDENCIES         ::
[warn]  ::::::::::::::::::::::::::::::::::::::::::::::
[warn]  :: org.scala-tools.sbt#sbt-android-plugin_2.9.1;0.6.0-SNAPSHOT: not found
[warn]  ::::::::::::::::::::::::::::::::::::::::::::::
[error] {file:/Users/macarse/Documents/scalatest/project/plugins/}default-dd299a/*:update: sbt.ResolveException: unresolved dependency: org.scala-tools.sbt#sbt-android-plugin_2.9.1;0.6.0-SNAPSHOT: not found
Project loading failed: (r)etry, (q)uit, (l)ast, or (i)gnore? 

What am I missing?

---

For sbt 0.11.0:

1. Follow instructions from @Debilski's answer to publish android-plugin to local.
2. rm -rvf project/plugins/
3. Create a file project/plugins.sbt, the content of this file is addSbtPlugin("org.scala-tools.sbt" % "sbt-android-plugin" % "0.6.0-SNAPSHOT")
4. Now you should be able to run sbt under that project
5. android:package-debug to compile/package the hello world program g8 created.
6. android:install-device to install the APK on the android device.

---

sbt-android-plugin has not been made public in version 0.6.0-SNAPSHOT. A quick fix would be to install it locally.

git clone https://github.com/jberkel/android-plugin.git 
cd android-plugin
sbt update
sbt publish-local

Of course, this works only as long as the github repository’s master branch points to version 0.6.0-SNAPSHOT. (If it doesn’t anymore, then I may suspect that 0.6.0 has been published.)