Started GET "/topics/new" for 10.203.228.119 at 2011-03-30 14:32:54 -0400
  Processing by TopicsController#new as HTML
Rendered topics/new.html.erb within layouts/application (0.5ms)
Completed   in 4ms

ActionView::Template::Error (undefined method `model_name' for NilClass:Class):
    1: <h1>Create a New Topic</h1>
    2:
    3:   <%= simple_form_for @topic do |t| %>
    4:     <%= t.button :submit %>
    5:   <% end %>
  app/views/topics/new.html.erb:3:in `_app_views_topics_new_html_erb__1570817854501073108_2177917720_2688844494710646396'