acts_as_authenticated + authorization plugin = Can only render or redirect once per action ?

Hi all,

I've got a strange trouble with those plugins in subject.
Im new in rails and just trying to get some basic things working
before proceeding to something more complicated.
So here is the step-by-step descirption of what i did:
$ mysqladmin create auth_development
$ rails auth
$ ./script/plugin install http://svn.techno-weenie.net/projects/plugins/acts_as_authenticated
$ ./script/plugin install http://svn.writertopia.com/svn/plugins/authorization
$ ./script/generate authenticated user account
$ ./script/generate role_model role
$ rake db:migrate

added following to my environment.rb:
AUTHORIZATION_MIXIN = "object roles"
DEFAULT_REDIRECTION_HASH = { :controller => 'account', :action =>
'login' }

added those to my user model:
  acts_as_authorized_user
  acts_as_authorizable

and this to my account controller
  def secure_info
    permit "admin"
    render :text => "you're admin if you can read this."
  end

  def for_testers
    permit "admin or tester"
    render :text => "you're admin or tester if you can read this."
  end

  def for_noone
    permit "noone"
    render :text => "you shouldnt be able to read this."
  end

  def add_sample_roles
    current_user.has_role "tester"
    current_user.has_role "admin"
    current_user.save!
    redirect_to :index
  end

$ ./script/server

(signed up as a new user, login, go to add_sample_roles)
now i can visit secure_info and for_testers okay, but when i try to
visit for_noone i didnt get the right error message like permission
denied but this one:
Can only render or redirect once per action

with this session dump:

/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/
action_controller/base.rb:708:in `render_with_no_layout'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/
action_controller/layout.rb:256:in `render_without_benchmark'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/
action_controller/benchmarking.rb:50:in `render'
/usr/local/lib/ruby/1.8/benchmark.rb:293:in `measure'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/
action_controller/benchmarking.rb:50:in `render'
app/controllers/account_controller.rb:56:in `for_someone'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/
action_controller/base.rb:1095:in `send'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/
action_controller/base.rb:1095:in `perform_action_without_filters'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/
action_controller/filters.rb:632:in `call_filter'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/
action_controller/filters.rb:638:in `call_filter'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/
action_controller/filters.rb:438:in `call'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/
action_controller/filters.rb:637:in `call_filter'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/
action_controller/filters.rb:619:in `perform_action_without_benchmark'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/
action_controller/benchmarking.rb:66:in
`perform_action_without_rescue'
/usr/local/lib/ruby/1.8/benchmark.rb:293:in `measure'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/
action_controller/benchmarking.rb:66:in
`perform_action_without_rescue'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/
action_controller/rescue.rb:83:in `perform_action'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/
action_controller/base.rb:430:in `send'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/
action_controller/base.rb:430:in `process_without_filters'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/
action_controller/filters.rb:624:in
`process_without_session_management_support'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/
action_controller/session_management.rb:114:in `process'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.13.3/lib/
action_controller/base.rb:330:in `process'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/dispatcher.rb:41:in
`dispatch'
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/rails.rb:
78:in `process'
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/rails.rb:
76:in `synchronize'
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/rails.rb:
76:in `process'
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:618:in
`process_client'
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:617:in
`each'
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:617:in
`process_client'
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:736:in
`run'
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:736:in
`initialize'
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:736:in
`new'
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:736:in
`run'
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:720:in
`initialize'
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:720:in
`new'
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:720:in
`run'
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/
configurator.rb:271:in `run'
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/
configurator.rb:270:in `each'
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/
configurator.rb:270:in `run'
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.1/bin/mongrel_rails:
127:in `run'
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/command.rb:
211:in `run'
/usr/local/lib/ruby/gems/1.8/gems/mongrel-1.0.1/bin/mongrel_rails:243
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/
active_support/dependencies.rb:488:in `load'
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/
active_support/dependencies.rb:488:in `load'
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/
active_support/dependencies.rb:342:in `new_constants_in'
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/
active_support/dependencies.rb:488:in `load'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/servers/
mongrel.rb:60
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_require'
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require'
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/
active_support/dependencies.rb:495:in `require'
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/
active_support/dependencies.rb:342:in `new_constants_in'
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.4.2/lib/
active_support/dependencies.rb:495:in `require'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/server.rb:
39
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_require'
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require'
script/server:3