Ruby on Rails

I installed Ruby on Rails 1.9.3 version on windows . I built a simple hello world program , the issue is that when I build it in sublime text 2 I get this error :"Uninitialized constant ApplicationController ( nameerror) " and I get the same error when run this program in the command line . My application_controller.rb look like this :

class ApplicationController < ActionController::Base

end

I installed the gems but I still get this error . I downloaded ruby rails to a mac and having the same issue.

The program :

class HelloworldsController < ApplicationController
 def hi
   puts "Hello world"
 end
end


Any thoughts pleas ?