I faced the same issue. Check your classpath to see if sbt-launch.jar is preceding scala-library.jar. Both of them have the same class; scala.Tuple2 from scala-library is the correct one.
After placing scala-library.jar higher in the classpath solved the issue. Thanks, Hussain ________________________________ NOTE: This message may contain information that is confidential, proprietary, privileged or otherwise protected by law. The message is intended solely for the named addressee. If received in error, please destroy and notify the sender. Any use of this email is prohibited when received in error. Impetus does not represent, warrant and/or guarantee, that the integrity of this communication has been maintained nor that the communication is free of errors, virus, interception or interference.
