'rake routes' gives error

when I run 'rake routes' I get the following error:

rake aborted! undefined method `session=' for ActionController::Base:Class

I believe the new cookie based sessions in environment.rb are causing the error:

config.action_controller.session = { :session_key => '_myapp_session', :secret => 'getyourownsecretkey' }

Isn't this supposed to be the default in rails? When I comment it out the rake works. Is this a bug problem?

Oh, and I'm on rails 1.2.5

Duh, the session method is only for 'edge' rails. Rails 1.2.5 doesn't have it yet.