我全新安装了 Ubuntu Karmic、Ruby 和 Rails。我签出一个工作（生产）应用程序。创建数据库并运行 rake 任务。确保我拥有所有必需的宝石，Jens Krämer 的acts_as_ferret 就是其中之一。
一切似乎都已正确安装。gem 列在 environment.rb 中，包括 AFF。
当我运行 rake 时，出现以下错误：
没有要加载的文件——雪貂 /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require' /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:156:in `require' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:521:in `new_constants_in' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:156:in `require' /usr/local/lib/ruby/gems/1.8/gems/jkraemer-acts_as_ferret-0.4.4/lib/acts_as_ferret.rb:25 /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require' /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:156:in `require' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:521:in `new_constants_in' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:156:in `require' /usr/local/lib/ruby/gems/1.8/gems/rails-2.3.4/lib/rails/gem_dependency.rb:208:in `load' /usr/local/lib/ruby/gems/1.8/gems/rails-2.3.4/lib/initializer.rb:307:in `load_gems' /usr/local/lib/ruby/gems/1.8/gems/rails-2.3.4/lib/initializer.rb:307:in `each' /usr/local/lib/ruby/gems/1.8/gems/rails-2.3.4/lib/initializer.rb:307:in `load_gems' /usr/local/lib/ruby/gems/1.8/gems/rails-2.3.4/lib/initializer.rb:164:in `process' /usr/local/lib/ruby/gems/1.8/gems/rails-2.3.4/lib/initializer.rb:113:in `send' /usr/local/lib/ruby/gems/1.8/gems/rails-2.3.4/lib/initializer.rb:113:in `run' /home/pp/ruby-dev/production-app/config/environment.rb:18 /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require' /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:156:in `require' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:521:in `new_constants_in' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:156:in `require' /usr/local/lib/ruby/gems/1.8/gems/rails-2.3.4/lib/tasks/misc.rake:4 /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `每个' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain' /usr/local/lib/ruby/1.8/monitor.rb:242:in `同步' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:607:in `invoke_prerequisites' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:604:in `每个' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:604:in `invoke_prerequisites' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:596:in `invoke_with_call_chain' /usr/local/lib/ruby/1.8/monitor.rb:242:in `同步' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:607:in `invoke_prerequisites' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:604:in `每个' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:604:in `invoke_prerequisites' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:596:in `invoke_with_call_chain' /usr/local/lib/ruby/1.8/monitor.rb:242:in `同步' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:583:in `invoke' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `each' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2001:in `run' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1998:in `run' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/bin/rake:31 /usr/local/bin/rake:19:in `load' /usr/local/bin/rake:19 没有要加载的文件——雪貂 /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require' /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:156:in `require' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:521:in `new_constants_in' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:156:in `require' /usr/local/lib/ruby/gems/1.8/gems/jkraemer-acts_as_ferret-0.4.4/lib/acts_as_ferret.rb:25 /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require' /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:156:in `require' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:521:in `new_constants_in' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:156:in `require' /usr/local/lib/ruby/gems/1.8/gems/rails-2.3.4/lib/rails/gem_dependency.rb:208:in `load' /usr/local/lib/ruby/gems/1.8/gems/rails-2.3.4/lib/initializer.rb:307:in `load_gems' /usr/local/lib/ruby/gems/1.8/gems/rails-2.3.4/lib/initializer.rb:307:in `each' /usr/local/lib/ruby/gems/1.8/gems/rails-2.3.4/lib/initializer.rb:307:in `load_gems' /usr/local/lib/ruby/gems/1.8/gems/rails-2.3.4/lib/initializer.rb:169:in `进程' /usr/local/lib/ruby/gems/1.8/gems/rails-2.3.4/lib/initializer.rb:113:in `send' /usr/local/lib/ruby/gems/1.8/gems/rails-2.3.4/lib/initializer.rb:113:in `run' /home/pp/ruby-dev/production-app/config/environment.rb:18 /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require' /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:156:in `require' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:521:in `new_constants_in' /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:156:in `require' /usr/local/lib/ruby/gems/1.8/gems/rails-2.3.4/lib/tasks/misc.rake:4 /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `每个' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain' /usr/local/lib/ruby/1.8/monitor.rb:242:in `同步' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:607:in `invoke_prerequisites' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:604:in `每个' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:604:in `invoke_prerequisites' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:596:in `invoke_with_call_chain' /usr/local/lib/ruby/1.8/monitor.rb:242:in `同步' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:607:in `invoke_prerequisites' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:604:in `每个' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:604:in `invoke_prerequisites' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:596:in `invoke_with_call_chain' /usr/local/lib/ruby/1.8/monitor.rb:242:in `同步' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:583:in `invoke' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `each' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2001:in `run' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1998:in `run' /usr/local/lib/ruby/gems/1.8/gems/rake-0.8.7/bin/rake:31 /usr/local/bin/rake:19:in `load' /usr/local/bin/rake:19 缺少这些必需的宝石： jkraemer-acts_as_ferret ~> 0.4.4 你正在运行： /usr/local/bin/ruby 上的 ruby 1.8.7.160 rubygems 1.3.5 位于 /home/pp/.gem/ruby/1.8、/usr/local/lib/ruby/gems/1.8 运行 `rake gems:install` 以安装缺少的 gem。/usr/local/lib/ruby/gems/1.8/gems/jkraemer-acts_as_ferret-0.4.4/lib/acts_as_ferret.rb:25
我不知道发生了什么事？