All tests are successfull after finishing chapter 11, and items in cart are displayed correctly, but jquery-ui does not found. Anyway as I understand, it hurts only highliting. But @cart is nil as I understand from error “undefined method for nil:NilClass” when I am trying to get access for @cart.line_items as it necessary to check is our cart empty for check out. Did anyone face with this problem? What can you advice me? Thank you!