Formastic and attribute_methods_generated? [closed]

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I am having an Issue with Formastic and Ruby On Rails Here is the run down Ruby and Rails info

• Ruby on Rails 3.0.7
• Ruby 1.9.2p180

• Formtastic 1.2.3 Here is the error

  undefined method `attribute_methods_generated?' for nil:NilClass

Controller

def new
   @assignment = Assignments.new
   @title = "Sign Up"
end

View

<% semantic_form_for(@assignment) do |f| %>
    <%= render 'shared/error_messages', :object => f.object %>
    <%= f.inputs :name, :duedate, :class, :priority, :grade, :descrption, :points_value %>
   <%= f.submit "New Assignment" %>
<% end %>

---

you have typos and reserved keywords in your example. you may want to check this again.

":class" is a reserved keyword, I suppose and "descrption" (typo)