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我正在尝试在我的 Snow Leopard Mac 上运行 Rails 应用程序。我以前从未使用过 Ruby 或 Rails，所以欢迎任何提示。

在终端中，我转到应用程序的文件夹，然后运行rails server 并收到以下错误：

Could not find gem 'mysql2 (>= 0) ruby' in any of the gem sources
listed in your Gemfile. Run `bundle install` to install missing gems.

我的 gemfile 看起来像：

source 'http://rubygems.org'

gem 'rails', '3.1.0'

# Bundle edge Rails instead:
# gem 'rails',     :git => 'git://github.com/rails/rails.git'

group :development do
  gem 'mysql2'
end

group :production do
  gem 'pg'
  gem 'thin'
end

并且适用database.yml于adapter: mysql2所有环境。我已经跑了bundle install，从跑步中gem list我得到了：

mysql2 (0.3.11)

我的宝石环境是：

RubyGems Environment:
  - RUBYGEMS VERSION: 1.8.17
  - RUBY VERSION: 1.9.3 (2012-02-16 patchlevel 125) [x86_64-darwin10.8.0]
  - INSTALLATION DIRECTORY: /Users/user/.rvm/gems/ruby-1.9.3-p125@rails3
  - RUBY EXECUTABLE: /Users/user/.rvm/rubies/ruby-1.9.3-p125/bin/ruby
  - EXECUTABLE DIRECTORY: /Users/user/.rvm/gems/ruby-1.9.3-p125@rails3/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-darwin-10
  - GEM PATHS:
     - /Users/user/.rvm/gems/ruby-1.9.3-p125@rails3
     - /Users/user/.rvm/gems/ruby-1.9.3-p125@global
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
  - REMOTE SOURCES:
     - http://rubygems.org/

到目前为止，我一直在解决这个问题超过两个小时，但没有运气。

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