Error in "Getting Started" Tutorial

I get this error on step 9 of the Getting Started tutorial at guides.rubyonrails.org

NoMethodError in PostsController#index

undefined method `accepts_nested_attributes_for' for #<Class: 0x23fbc48>

Does anyone know if it's a bug?

I get this error on step 9 of the Getting Started tutorial at guides.rubyonrails.org

NoMethodError in PostsController#index

undefined method `accepts_nested_attributes_for' for #<Class: 0x23fbc48>

Sounds like you're following the guide for rails 2.3 but using rails 2.2 (this is a feature new in 2.3)

Fred