OAuthException 101 in rails 3.2 app

I get this error in my app

{
   "error": {
      "message": "Missing client_id parameter.",
      "type": "OAuthException",
      "code": 101
   }
}

what I've done: - I have a config/initializers/omniauth.rb file containing:

Rails.application.config.middleware.use OmniAuth::Builder do
  provider :facebook, ENV['my App ID:'], ENV['my app Secret']
end

• I have a view containing link_to "Log in with Facebook", "/auth/facebook"

My app is not embeded in facebook and this error happens in my online app (not localhost) Here is my Gemfile

gem 'rails', '3.2.2'
gem 'fbgraph'
gem 'omniauth'
gem 'omniauth-facebook'

gem 'mysql2'
gem 'less-rails'
group :assets do
  gem 'less-rails'
  gem 'coffee-rails', '~> 3.2.1'
  gem 'twitter-bootstrap-rails'
   gem 'therubyracer'

  gem 'uglifier', '>= 1.0.3'
end

gem 'jquery-rails'

Thank you for helping

Try removing ENV[]:

Rails.application.config.middleware.use OmniAuth::Builder do
  provider :facebook, 'my App ID:', 'my app Secret'
end