title: How to fix NoSuchMethodError?
body: <p>I use Scala 2.10.0RC1 and sbt 0.12.1.
  What causes and how can I fix this runtime error (runs fine on 2.9.2)?</p>
  
  <p>The exact error message is:</p>
  
  <blockquote>
    <p>java.lang.NoSuchMethodError: scala.Predef$ArrowAssoc$.extension$$minus$greater(Ljava/lang/Object;Ljava/lang/Object;)Lscala/Tuple2;</p>
  </blockquote>