SCR lib?
All I know is that we don't
have any global libraries defined, simply isn't needed for the game to work. So I don't imagine you should need it unless you've really changed around some stuff - in which case your setup is too different for us to really help
We've simply got /libs/groovy-all-1.8.2.jar under the project root (which is how it lives in GitHub) and everything Groovy works.
Do you have your code accessible somewhere? If you could make it easily viewable that would make it a lot easier to get an idea of what might be wrong.