acl_system2 : undefined method `access_control'

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I am using acl_system2 plugin to implement my authorization. (with restful_authentication plugin)

- plugin install ./script/plugin install http://opensvn.csie.org/ezra/rails/plugins/dev/acl_system2

- class UsersController < ApplicationController access_control :new => '(admin)'

- error undefined method `access_control' in UsersController

Please help me, advanced! thanks