Rails 3, ruby 1.9.1p378

ActionView::Template::Error (undefined method `generated_methods?' for #<Class:0x00000005237550>) on line #6 of blabla/app/views/articles/index.html.erb:
3: <div class="box wide">
4:      <% @categories.each do |category| %>
5:              <h3>
6:                      <%= category.name %>
7:              </h3>
8:
9:              <% category.articles.nodrafts.ordered.each do |article| %>

...

@categories = Category.ordered.domain Category::DOMAIN_NEWS

..

class Category < ActiveRecord::Base
    named_scope :ordered, :order => "sort ASC, created_at DESC"
    named_scope :domain, lambda { |domain| {:conditions => {:domain => domain}} }


..


Loading production environment (Rails 3.0.0.beta3)
ruby-1.9.1-p378 > Category.first
 => #<Category id: 1, name: "League", sort: 1, created_at: "2009-05-28 14:15:53", updated_at: "2009-07-05 08:46:03", domain: 0>
ruby-1.9.1-p378 > Category.first.name
NoMethodError: undefined method `generated_methods?' for #<Class:0x0000000548aba8>
        from /var/www/virtual/blabla.com/.rvm/gems/ruby-1.9.1-p378/gems/activerecord-3.0.0.beta3/lib/active_record/base.rb:1141:in `method_missing'
        from /var/www/virtual/blabla.com/ensl/vendor/plugins/will_paginate/lib/will_paginate/finder.rb:170:in `method_missing_with_paginate'
        from /var/www/virtual/blabla.com/ensl/vendor/plugins/validates_timeliness/lib/validates_timeliness/active_record/attribute_methods.rb:46:in `define_attribute_methods_with_timeliness'
        from /var/www/virtual/blabla.com/.rvm/gems/ruby-1.9.1-p378/gems/activerecord-3.0.0.beta3/lib/active_record/attribute_methods.rb:31:in `method_missing'
        from (irb):2
        from /var/www/virtual/blabla.com/.rvm/gems/ruby-1.9.1-p378/gems/railties-3.0.0.beta3/lib/rails/commands/console.rb:47:in `start'
        from /var/www/virtual/blabla.com/.rvm/gems/ruby-1.9.1-p378/gems/railties-3.0.0.beta3/lib/rails/commands/console.rb:8:in `start'
        from /var/www/virtual/blabla.com/.rvm/gems/ruby-1.9.1-p378/gems/railties-3.0.0.beta3/lib/rails/commands.rb:34:in `<top (required)>'
        from script/rails:9:in `require'
        from script/rails:9:in `<main>'