guard start 「no such file to load -- rspec/matchers/have (LoadError) 」エラー対処

gistfile1.txt

◆Gemfile
----------
group :test do
  gem 'rspec', '2.9.0'  # Behavior Driven Development (BDD) for Ruby
  gem 'rspec-core', '2.9.0'  # RSpec runner and example groups.
  gem 'rspec-expectations', '2.9.0'  # RSpec matchers for should and should_not.
  gem 'rspec-mocks', '2.9.0'  # RSpec test double framework with stubbing and mocking.
  gem 'rspec-rails', '2.9.0'  # RSpec version 2.x for Rails version 3.x.
end
----------

◆環境
$ ruby -v
ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-darwin10.8.0]

$ rails -v
Rails 3.0.9