error: can't convert Module into String
app/controllers/mailsend_controller.rb:2

# controller
class MailsendController < ApplicationController
 require Moduser
before_filter :check_administrator_role

#module Moduser

  def check_role(role)
     unless logged_in? && @current_user.has_role?(role)
       if logged_in?
           permission_denied
         else
           store_referer
           access_denied
         end
       end
     end

     def check_administrator_role
       check_role('moderator')
     end