Working on 'Gosu' Gem

I'm back to working on the 'Gosu' Gem game. I'm on chapter 7. I've found one error in chapter 5 missing 'If' statement. studied 3 hours yesterday, got too tired forgot to blog. Studying now at Panera's.
I'm working on an error in lesson 7, can't figure out what it is, I'll let you know when I do. -Josh