[Rails] Need help...NameError in InteractController#add_to_cart

Hi, I am developing a web app and am following the text-Agile web development..... Each time I click my "add to cart" button" i always get the  page below:I have double checked to see if i have errors in my code,there was none,please what do i need to do to proceed? NameError in InteractController#add_to_cart undefined local variable or method `find_cart' for #<InteractController:0x1042d0780> RAILS_ROOT: /Users/oluwayomioluwadara/Documents/CED/coursework/heritage/heritage Application Trace | Framework Trace | Full Trace /Users/oluwayomioluwadara/Documents/CED/coursework/heritage/heritage/app/controllers/interact_controller.rb:8:in `add_to_cart' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.4/lib/action_controller/base.rb:1331:in `send' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.4/lib/action_controller/base.rb:1331:in `perform_action_without_filters'  /Library/Ruby/Gems/1.8/gems/actionpack-2.3.4/lib/action_controller/filters.rb:617:in `call_filters'Regards and Respects, Kindness in thought leads to wisdom. Kindness in speech leads to eloquence. Kindness in action leads to love.

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