I get the error message bellow, it looks like the wrong error message 
because I got it while
using SBT 0.11.0 and 0.11.2 

The relevant files are :

============== ./project/build.properties===================

 sbt.version=0.11.0

============== ./project/plugins.sbt ===================

addSbtPlugin("com.typesafe.startscript" % "xsbt-start-script-plugin" % 
"0.3.0")

============== ./project/Build.scala ===================


import sbt._
import Keys._
import com.typesafe.startscript.StartScriptPlugin

  
object Buildz extends Build {

  def buildSettings = 
    Defaults.defaultSettings ++ 
    StartScriptPlugin.startScriptForClassesSettings ++ Seq(
      organization := "net.strong_links",
      version := "0.9",
      scalaVersion := "2.9.1",
        resolvers += ScalaToolsSnapshots
    )

  lazy val buildProject = Project(
    id = "project",
    base = file("project")
  )  

  val jettyVersion = "7.5.4.v20111024"
  
  
  lazy val htest = Project(
    id = "htest",
    base = file("htest"),
    settings = buildSettings ++ Seq(      
      libraryDependencies  ++= Seq(
        "net.databinder" %% "unfiltered-filter" % "0.5.1",
        "net.databinder" %% "unfiltered-jetty" % "0.5.1",
        "org.slf4j" % "slf4j-api" % "1.6.1",
        "ch.qos.logback" % "logback-classic" % "1.0.0",
        "org.eclipse.jetty" % "jetty-webapp" % jettyVersion
      )
    )
  )

  lazy val root = Project(
    id = "root",
    base = file("."),
    settings = buildSettings 
  ) aggregate(htest)
}

==============================================================


$ git push heroku master
Counting objects: 19, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (10/10), done.
Writing objects: 100% (19/19), 1.89 KiB, done.
Total 19 (delta 1), reused 0 (delta 0)

-----> Heroku receiving push
-----> Scala app detected
 !      Error, you have defined an unsupported sbt.version in 
project/build.properties
 !      You must use a release verison of sbt, sbt.version=0.11.0 or greater
 !     Heroku push rejected, failed to compile Scala app

To [email protected]:radiant-leaf-3551.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to '[email protected]:radiant-leaf-3551.git'

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