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...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_cartundefined local variable or method `find_cart'' for #<InteractController:0x1042d0780>RAILS_ROOT: /Users/oluwayomioluwadara/Documents/CED/coursework/heritage/heritageApplication 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_controll...