Radiant extension

Question

Im developing a simple extension to Radiant. I created a controller, using the generator available, like

class NewsletterController < ApplicationController
  no_login_required
  skip_before_filter :verify_authenticity_token
  def send
    @news = Newsletter.find_or_create_by_email(params[:email])
    @news.save
    flash[:notice] = "Your e-mail was added to our newsletter"
    redirect_back_or_default("/")
  end
end

My routes are ok, so i tried to access http://localhost:3000/newsletter/[email protected] but didnt work. Im received the error "wrong number of arguments (1 for 0)". Am I missing something here related with Radiant Controllers?