Have you tried using the latest version (v3, which for some reason does not seem to have been mentioned here, but has been on the models and texture boards)?
If that doesn't work, do you have the latest version of java installed? (or at least 1.6?) (I'm just guessing here; I've never seen such an error to be honest)
If that doesn't work, do you have the latest version of java installed? (or at least 1.6?) (I'm just guessing here; I've never seen such an error to be honest)