Please Help ME !!!!!!!

[lakecat]

I would avoid setting rightWheel to inverted, it may be the source of some of your errors. In fact, it seems like you don't need grabBall at all, considering it does the same thing as shootBall, except with a different method of getting one wheel to move the opposite direction of the other. It looks like you need to negate your input to shootBall in your first if statement.