Rails - Mar 2007 - active_rbac doesn't understand before_filter

I''ve moved an application onto the production server, and found that
when I run it under the production environment active_rbac doesn''t work
(it''s fine under the development environment). I find this in the logs
when trying to view a protected page:

NoMethodError (undefined method `before_filter'' for
ActiveRbac::ComponentController:Class):
/app/controllers/active_rbac/component_controller.rb:2
...lots more stuff...

The offending code is:

class ActiveRbac::ComponentController
        before_filter :protect_with_active_rbac

        protected

                def protect_with_active_rbac
                        # only protect certain controllers
                        return true if [ActiveRbac::LoginController,
ActiveRbac::RegistrationController,
ActiveRbac::MyAccountController].include?(self.class)

                        # protect!
                        if !session[:rbac_user_id].nil? and
User.find_by_id(session[:rbac_user_id]).has_role?("Admin")
                                return true
                        else
                                flash[:notice] = "Please log in to
access this page."
                                redirect_to "/login"
                                return false
                        end
                end
end

Can anyone suggest where I might begin to look for the cause of this
error?

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