undefined method rails question

<%form_for @question do |f| %>
   <%=f.text_field :title %>
<%end%>

map.resources :questions

map.ask_question '/questions/ask', :controller => 'questions', :action => 'create'

>ruby script/generate scaffold question question:string answer:string votes:integer
  exists  app/models/
  exists  app/controllers/
  exists  app/helpers/
  create  app/views/questions
  exists  app/views/layouts/
  exists  test/functional/
  exists  test/unit/
  exists  public/stylesheets/
  create  app/views/questions/index.html.erb
  create  app/views/questions/show.html.erb
  create  app/views/questions/new.html.erb
  create  app/views/questions/edit.html.erb
  create  app/views/layouts/questions.html.erb
  create  public/stylesheets/scaffold.css
  create  app/controllers/questions_controller.rb
  create  test/functional/questions_controller_test.rb
  create  app/helpers/questions_helper.rb
  route  map.resources :questions
  dependency  model
  exists    app/models/
  exists    test/unit/
  exists    test/fixtures/
  create    app/models/question.rb
  create    test/unit/question_test.rb
  create    test/fixtures/questions.yml
  create    db/migrate
  create    db/migrate/20081201150131_create_questions.rb