`require': cannot load such file -- rspec (LoadError)

Hello everyone

Gemfile:

    source 'https://rubygems.org'

    gem 'rails'

    gem 'sqlite3'
    gem 'youtube_it'
    gem 'viddl-rb'
    gem 'paperclip'
    gem 'paperclip-dropbox', :git => 'git://github.com/janko-m/paperclip-dropbox.git'
    gem 'squeel'

    group :assets do
      gem 'sass-rails',   '~> 3.2.3'
      gem 'coffee-rails', '~> 3.2.1'

      gem 'uglifier', '>= 1.0.3'
    end

    gem 'jquery-rails'

    group :test, :development do
      gem 'rspec-rails'
    end

    group :test do
      gem 'factory_girl_rails'
      gem 'shoulda-matchers', :git => 'git://github.com/thoughtbot/shoulda-matchers.git'
      gem 'vcr'
      gem 'fakeweb'
      gem 'database_cleaner'
    end


I've got exception:

    /Users/roman/.rvm/gems/ruby-1.9.3-p327@sample_project/gems/activesupport-3.2.11/lib/active_support/dependencies.rb:251:in `require': cannot load such file -- rspec (LoadError)
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@sample_project/gems/activesupport-3.2.11/lib/active_support/dependencies.rb:251:in `require': cannot load such file -- rspec (LoadError)
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@sample_project/gems/activesupport-3.2.11/lib/active_support/dependencies.rb:251:in `block in require'
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@sample_project/gems/activesupport-3.2.11/lib/active_support/dependencies.rb:236:in `load_dependency'
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@sample_project/gems/activesupport-3.2.11/lib/active_support/dependencies.rb:251:in `require'
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@sample_project/bundler/gems/shoulda-matchers-f7337c62bb8f/lib/shoulda/matchers/integrations/rspec.rb:2:in `<top (required)>'
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@sample_project/gems/activesupport-3.2.11/lib/active_support/dependencies.rb:251:in `require'
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@sample_project/gems/activesupport-3.2.11/lib/active_support/dependencies.rb:251:in `block in require'
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@sample_project/gems/activesupport-3.2.11/lib/active_support/dependencies.rb:236:in `load_dependency'
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@sample_project/gems/activesupport-3.2.11/lib/active_support/dependencies.rb:251:in `require'
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@sample_project/bundler/gems/shoulda-matchers-f7337c62bb8f/lib/shoulda/matchers.rb:6:in `<top (required)>'
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:74:in `require'
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:74:in `rescue in block in require'
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:62:in `block in require'
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:55:in `each'
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:55:in `require'
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@global/gems/bundler-1.2.3/lib/bundler.rb:128:in `require'
    from /Users/roman/projects/sample_project/config/application.rb:13:in `<top (required)>'
    from /Users/roman/projects/sample_project/config/environment.rb:2:in `require'
    from /Users/roman/projects/sample_project/config/environment.rb:2:in `<top (required)>'
    from /Users/roman/projects/sample_project/spec/spec_helper.rb:3:in `require'
    from /Users/roman/projects/sample_project/spec/spec_helper.rb:3:in `<top (required)>'
    from /Users/roman/projects/sample_project/spec/models/sample_model_spec.rb:1:in `require'
    from /Users/roman/projects/sample_project/spec/models/sample_model_spec.rb:1:in `<top (required)>'
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@sample_project/gems/rspec-core-2.12.2/lib/rspec/core/configuration.rb:789:in `load'
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@sample_project/gems/rspec-core-2.12.2/lib/rspec/core/configuration.rb:789:in `block in load_spec_files'
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@sample_project/gems/rspec-core-2.12.2/lib/rspec/core/configuration.rb:789:in `each'
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@sample_project/gems/rspec-core-2.12.2/lib/rspec/core/configuration.rb:789:in `load_spec_files'
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@sample_project/gems/rspec-core-2.12.2/lib/rspec/core/command_line.rb:22:in `run'
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@sample_project/gems/rspec-core-2.12.2/lib/rspec/core/runner.rb:80:in `run'
    from /Users/roman/.rvm/gems/ruby-1.9.3-p327@sample_project/gems/rspec-core-2.12.2/lib/rspec/core/runner.rb:17:in `block in autorun'

This small fix should resolve problem

Thanks