[alopex_rex]

You'll probably have to provide some more specific information before we can do much with this. "Does not work" is pretty vague, and not very useful to anyone who can't see you code or test your robot.

My advice is always to break things down into the smallest steps. First try making a RobotDrive object and not doing anything with it, and see if it compiles. Next test your motor controllers directly, to make sure it's not an electrical issue. Next try using the arcade drive function, using constants for the inputs, not joystick input. Go on like this, and once you find something that doesn't work you'll have an idea where your problem lies.