uninitialized constant ApplicationController::Settler in Production environment

[maceto]

I don't know way on production environment the gem is not initialized correctly.

Gems

Rails 3.0.12
Settler 1.2.3

Error:

Completed 500 Internal Server Error in 207ms

ActionView::Template::Error (uninitialized constant ApplicationController::Settler):
    79:             .text-newsletter
    80:               Seguinos en:
    81:           .social-links
    82:             = link_to image_tag("facebook.png"), "http://www.facebook.com/#{facebook_user}"
    83:           .social-links
    84:             = link_to image_tag("twitter.png"), "http://www.twitter.com/#{twitter_user}"
    85: 
  app/controllers/application_controller.rb:51:in `facebook_user'
  app/views/layouts/application.html.haml:82:in `_app_views_layouts_application_html_haml___672982_70267324214000_0'

Application controller.

  helper_method :twitter_user, :facebook_user

  def twitter_user
    @twitter_user ||= Settler.twitter_user.value
  end

  def facebook_user
    @facebook_user ||= Settler.facebook_user.value
  end

[moiristo]

Never encountered this issue before and we use it in production in several projects. Does the problem disappear when you explicitly require settler on initialization?