我使用 ruby 2 和 rails 3 创建了我的第一个测试应用程序。当我使用命令时，rails server我得到了这个：
/Users/speedy/.rvm/gems/ruby-2.0.0-p195/gems/mysql2-0.3.11/lib/mysql2.rb:9:in `require': dlopen(/Users/speedy/.rvm/gems/ruby-2.0.0-p195/gems/mysql2-0.3.11/lib/mysql2/mysql2.bundle, 9): Library not loaded: libmysqlclient.18.dylib (LoadError)
Referenced from: /Users/speedy/.rvm/gems/ruby-2.0.0-p195/gems/mysql2-0.3.11/lib/mysql2/mysql2.bundle
Reason: image not found - /Users/speedy/.rvm/gems/ruby-2.0.0-p195/gems/mysql2-0.3.11/lib/mysql2/mysql2.bundle
from /Users/speedy/.rvm/gems/ruby-2.0.0-p195/gems/mysql2-0.3.11/lib/mysql2.rb:9:in `<top (required)>'
from /Users/speedy/.rvm/gems/ruby-2.0.0-p195@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `require'
from /Users/speedy/.rvm/gems/ruby-2.0.0-p195@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `block (2 levels) in require'
from /Users/speedy/.rvm/gems/ruby-2.0.0-p195@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `each'
from /Users/speedy/.rvm/gems/ruby-2.0.0-p195@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `block in require'
from /Users/speedy/.rvm/gems/ruby-2.0.0-p195@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `each'
from /Users/speedy/.rvm/gems/ruby-2.0.0-p195@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `require'
from /Users/speedy/.rvm/gems/ruby-2.0.0-p195@global/gems/bundler-1.3.5/lib/bundler.rb:132:in `require'
from /Users/speedy/Sites/simple_cms/config/application.rb:7:in `<top (required)>'
from /Users/speedy/.rvm/gems/ruby-2.0.0-p195/gems/railties-3.2.13/lib/rails/commands.rb:53:in `require'
from /Users/speedy/.rvm/gems/ruby-2.0.0-p195/gems/railties-3.2.13/lib/rails/commands.rb:53:in `block in <top (required)>'
from /Users/speedy/.rvm/gems/ruby-2.0.0-p195/gems/railties-3.2.13/lib/rails/commands.rb:50:in `tap'
from /Users/speedy/.rvm/gems/ruby-2.0.0-p195/gems/railties-3.2.13/lib/rails/commands.rb:50:in `<top (required)>'
from script/rails:6:in `require'
Speedys-MacBook-Pro:simple_cms speedy$
不知道什么似乎错了。任何指针？