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NoMethodError: undefined method `slugs' for nil:NilClass
.bundle/ruby/1.9.1/gems/friendly_id-3.0.4/lib/friendly_id/active_record_adapter/slug.rb:42:in `enable_name_reversion'
.bundle/ruby/1.9.1/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:178:in `evaluate_method'
.bundle/ruby/1.9.1/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:166:in `call'
.bundle/ruby/1.9.1/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:93:in `block in run'
.bundle/ruby/1.9.1/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:92:in `each'
.bundle/ruby/1.9.1/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:92:in `run'
.bundle/ruby/1.9.1/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:276:in `run_callbacks'
.bundle/ruby/1.9.1/gems/activerecord-2.3.8/lib/active_record/callbacks.rb:344:in `callback'