每次都出现的rails警告

最近用ruby script/generate controller类似的命令 php?name=rails" onclick="tagshow(event)" class="t_tag">rails比平时多一个警告，然后程序看起来像是像以前一样 比如


D:\rails\rails>ruby script/generate controller new
Gem::SourceIndex#search support for Regexp patterns is deprecated
c:/ruby/lib/ruby/gems/1.8/gems/rails-2.1.1/lib/rails_generator/lookup.rb:211:in `each' is outdated
  exists app/controllers/
  exists app/helpers/
  create app/views/new
  exists test/functional/
  create app/controllers/new_controller.rb
  create test/functional/new_controller_test.rb
  create app/helpers/new_helper.rb

D:\rails\rails>


谁能告诉我这是为什么...

看看是不是环境引起的不一致，比如，Rails升级后。