uninitialized constant ActiveSupport::CoreExtensions (NameError)

[halid]

hi guys,

i installed devise on devise_facebook_connectable plugin. But command traced output

rails generate devise_facebook_connectable --api API_KEY --secret SECRET_KEY

/Users/halid/.rvm/gems/ruby-1.9.3-p194@global/gems/facebooker-1.0.75/lib/facebooker/adapters/adapter_base.rb:6:in `<class:AdapterBase>': uninitialized constant ActiveSupport::CoreExtensions (NameError)
    from /Users/halid/.rvm/gems/ruby-1.9.3-p194@global/gems/facebooker-1.0.75/lib/facebooker/adapters/adapter_base.rb:3:in `<module:Facebooker>'
    from /Users/halid/.rvm/gems/ruby-1.9.3-p194@global/gems/facebooker-1.0.75/lib/facebooker/adapters/adapter_base.rb:1:in `<top (required)>'
    from /Users/halid/.rvm/gems/ruby-1.9.3-p194@global/gems/facebooker-1.0.75/lib/facebooker.rb:259:in `<top (required)>'
    from /Users/halid/.rvm/gems/ruby-1.9.3-p194@global/gems/devise_facebook_connectable-0.2.2/lib/devise_facebook_connectable.rb:3:in `<top (required)>'
    from /Users/halid/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.5/lib/bundler/runtime.rb:68:in `require'
    from /Users/halid/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.5/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
    from /Users/halid/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.5/lib/bundler/runtime.rb:66:in `each'
    from /Users/halid/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.5/lib/bundler/runtime.rb:66:in `block in require'
    from /Users/halid/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.5/lib/bundler/runtime.rb:55:in `each'
    from /Users/halid/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.5/lib/bundler/runtime.rb:55:in `require'
    from /Users/halid/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.5/lib/bundler.rb:119:in `require'
    from /Users/halid/RubymineProjects/kh-network_v2/config/application.rb:7:in `<top (required)>'
    from /Users/halid/.rvm/gems/ruby-1.9.3-p194@global/gems/railties-3.2.6/lib/rails/commands.rb:53:in `require'
    from /Users/halid/.rvm/gems/ruby-1.9.3-p194@global/gems/railties-3.2.6/lib/rails/commands.rb:53:in `block in <top (required)>'
    from /Users/halid/.rvm/gems/ruby-1.9.3-p194@global/gems/railties-3.2.6/lib/rails/commands.rb:50:in `tap'
    from /Users/halid/.rvm/gems/ruby-1.9.3-p194@global/gems/railties-3.2.6/lib/rails/commands.rb:50:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

Gemfile

source 'https://rubygems.org'
gem 'rails', '3.2.6'
gem 'mysql2'
group :assets do
  gem 'sass-rails',   '~> 3.2.3'
  gem 'coffee-rails', '~> 3.2.1'
  gem 'uglifier', '>= 1.0.3'
end
gem 'jquery-rails'
gem 'devise'
gem 'devise_invitable'
gem "rails_admin", :git => "git://github.com/sferik/rails_admin.git"
gem "settingslogic"
gem 'devise_security_extension'
gem 'devise_facebook_connectable'
gem 'facebooker'
gem 'rails_email_validator'
gem 'devise-basecamper'
gem 'devise-twitter'
gem 'activesupport'

environment.rb

config.gem 'devise_facebook_connectable'
config.gem 'devise'
config.gem 'facebooker'

I wonder where the error am I doing?

Thanks,