Action controller on localhost error?

I think I asked that question the right way… I am getting an error while following this tut http://net.tutsplus.com/tutorials/ruby/create-beautiful-administration-interfaces-with-active-admin/ I am on the step where you connect to localhost localhost:3000/admin where it is supposed to be a login form the page is screwed up…

I am sure I am most likely doing something stupid or I’m missing something but any insight would help me a lot… Thanks

Processing by ActiveAdmin::Devise::SessionsController#new as HTML
  Rendered c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activeadmin-0.4.3/app/views/active_admin/devise/se
ssions/new.html.erb within layouts/active_admin_logged_out (93.0ms)
Completed 500 Internal Server Error in 106ms

ActionView::Template::Error (super: no superclass method `buttons' for #<ActiveAdmin::FormBuilder:0x2bc82e8>):
    8:       f.input :password
    9:       f.input :remember_me, :as => :boolean, :if =>  false  #devise_mapping.rememberable? }
    10:     end
    11:     f.buttons do
    12:       f.commit_button "Login"
    13:     end
    14:   end
  activeadmin (0.4.3) lib/active_admin/form_builder.rb:30:in `block in buttons'
  activeadmin (0.4.3) lib/active_admin/form_builder.rb:118:in `with_new_form_buffer'
  activeadmin (0.4.3) lib/active_admin/form_builder.rb:29:in `buttons'
  activeadmin (0.4.3) app/views/active_admin/devise/sessions/new.html.erb:11:in `block in _c___ails_nstaller__uby_
_____lib_ruby_gems_______gems_activeadmin_______app_views_active_admin_devise_sessions_new_html_erb___810936303_27
053280'
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  formtastic (2.2.0) lib/formtastic/helpers/form_helper.rb:160:in `semantic_form_for'
  activeadmin (0.4.3) lib/active_admin/view_helpers/form_helper.rb:8:in `active_admin_form_for'
  activeadmin (0.4.3) app/views/active_admin/devise/sessions/new.html.erb:5:in `_c___ails_nstaller__uby______lib_r
uby_gems_______gems_activeadmin_______app_views_active_admin_devise_sessions_new_html_erb___810936303_27053280'
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  actionpack (3.2.3) lib/abstract_controller/rendering.rb:110:in `_render_template'
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  devise (2.0.4) app/controllers/devise/sessions_controller.rb:9:in `new'
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cks'
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  c:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
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  c:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'


  Rendered c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/middlewa
mplates/rescues/_trace.erb (6.0ms)
  Rendered c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/middlewa
mplates/rescues/_request_and_response.erb (1.0ms)
  Rendered c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/actionpack-3.2.3/lib/action_dispatch/middlewa
mplates/rescues/template_error.erb within rescues/layout (49.0ms)
 

I believe that the newest version of Formtastic (which is required by active_admin) breaks active_admin.

1.) Add the following to your gemfile

gem "formtastic", "~> 2.1.1"

2.) Then run bundle update formtastic from the command line.

3.) Restart your server and let us know if it works!