Programming Tips - Why is my application crashing with this error?

Date: 2013nov11 Language: scala Q. Why is my application crashing with this error?
java.lang.NoSuchMethodError: scala.Predef$.augmentString(Ljava/lang/String;)Ljava/lang/String;
A. Probably because you are running it with a different Scala Libary than you built it with. Update scala-libary.jar on the running machine.