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我是在 OSX 机器上运行 Ruby 1.9.2 的 Rails 新手，当我转而使用 Thin 时出现以下错误（值得一提的是，我在全新的 Rails 应用程序上使用了 gemset，它可以工作，所以我知道它与我编写的代码或配置有关

就我安装的宝石而言：

gem 'rails', '3.2.3'

# Bundle edge Rails instead:
# gem 'rails', :git => 'git://github.com/rails/rails.git'
gem 'thin'
gem 'pg'
gem 'tire'
gem 'newrelic_rpm'
gem 'devise'

这是我在运行“rails c”时遇到的错误

/Users/me/.rvm/gems/ruby-1.9.2-p318/gems/railties-3.2.3/lib/rails/railtie/configurable.rb:30:in `method_missing': undefined method `development' for #<My::Application:0x007fa4fd937fe8> (NoMethodError)
    from /Users/me/Dropbox/2_Development/rails_projects/my/config/environments/development.rb:9:in `block in <top (required)>'
    from /Users/me/.rvm/gems/ruby-1.9.2-p318/gems/railties-3.2.3/lib/rails/railtie/configurable.rb:24:in `class_eval'
    from /Users/me/.rvm/gems/ruby-1.9.2-p318/gems/railties-3.2.3/lib/rails/railtie/configurable.rb:24:in `configure'
    from /Users/me/Dropbox/2_Development/rails_projects/my/config/environments/development.rb:1:in `<top (required)>'
    from /Users/me/.rvm/gems/ruby-1.9.2-p318/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:251:in `require'
    from /Users/me/.rvm/gems/ruby-1.9.2-p318/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:251:in `block in require'
    from /Users/me/.rvm/gems/ruby-1.9.2-p318/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:236:in `load_dependency'
    from /Users/me/.rvm/gems/ruby-1.9.2-p318/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:251:in `require'
    from /Users/me/.rvm/gems/ruby-1.9.2-p318/gems/railties-3.2.3/lib/rails/engine.rb:571:in `block in <class:Engine>'
    from /Users/me/.rvm/gems/ruby-1.9.2-p318/gems/railties-3.2.3/lib/rails/initializable.rb:30:in `instance_exec'
    from /Users/me/.rvm/gems/ruby-1.9.2-p318/gems/railties-3.2.3/lib/rails/initializable.rb:30:in `run'
    from /Users/me/.rvm/gems/ruby-1.9.2-p318/gems/railties-3.2.3/lib/rails/initializable.rb:55:in `block in run_initializers'
    from /Users/me/.rvm/gems/ruby-1.9.2-p318/gems/railties-3.2.3/lib/rails/initializable.rb:54:in `each'
    from /Users/me/.rvm/gems/ruby-1.9.2-p318/gems/railties-3.2.3/lib/rails/initializable.rb:54:in `run_initializers'
    from /Users/me/.rvm/gems/ruby-1.9.2-p318/gems/railties-3.2.3/lib/rails/application.rb:136:in `initialize!'
    from /Users/me/.rvm/gems/ruby-1.9.2-p318/gems/railties-3.2.3/lib/rails/railtie/configurable.rb:30:in `method_missing'
    from /Users/me/Dropbox/2_Development/rails_projects/my/config/environment.rb:5:in `<top (required)>'
    from /Users/me/.rvm/gems/ruby-1.9.2-p318/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:251:in `require'
    from /Users/me/.rvm/gems/ruby-1.9.2-p318/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:251:in `block in require'
    from /Users/me/.rvm/gems/ruby-1.9.2-p318/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:236:in `load_dependency'
    from /Users/me/.rvm/gems/ruby-1.9.2-p318/gems/activesupport-3.2.3/lib/active_support/dependencies.rb:251:in `require'
    from /Users/me/.rvm/gems/ruby-1.9.2-p318/gems/railties-3.2.3/lib/rails/application.rb:103:in `require_environment!'
    from /Users/me/.rvm/gems/ruby-1.9.2-p318/gems/railties-3.2.3/lib/rails/commands.rb:40:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

请帮助...这让我发疯...或指出如何自己调试问题

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