ruby-on-rails - 无法激活 Rake (> 0.0.0)？

Question

好吧，这很奇怪。我正在尝试进行数据库迁移，但突然出现以下错误:

[C:\source\fe]: rake db:migrate --trace
(in C:/source/fe)
** Invoke db:migrate (first_time)
** Invoke setup (first_time)
** Invoke gems:install (first_time)
** Invoke gems:set_gem_status (first_time)
** Execute gems:set_gem_status
** Execute gems:install
rake aborted!
can`'t activate rake (> 0.0.0), already activated rake-0.8.3]
c:/ruby/lib/ruby/site_ruby/1.8/rubygems.rb:139:in `activate'
c:/ruby/lib/ruby/site_ruby/1.8/rubygems.rb:155:in `activate'
c:/ruby/lib/ruby/site_ruby/1.8/rubygems.rb:154:in `each'
c:/ruby/lib/ruby/site_ruby/1.8/rubygems.rb:154:in `activate'
c:/ruby/lib/ruby/site_ruby/1.8/rubygems.rb:49:in `gem'
C:/source/fe/config/../vendor/rails/railties/lib/rails/gem_dependency.rb:36:in `add_load_paths'
C:/source/fe/config/../vendor/rails/railties/lib/initializer.rb:245:in `add_gem_load_paths'
C:/source/fe/config/../vendor/rails/railties/lib/initializer.rb:245:in `each'
C:/source/fe/config/../vendor/rails/railties/lib/initializer.rb:245:in `add_gem_load_paths'
C:/source/fe/config/../vendor/rails/railties/lib/initializer.rb:97:in `send'
C:/source/fe/config/../vendor/rails/railties/lib/initializer.rb:97:in `run'
C:/source/fe/config/gems.rb:45:in `init_dependencies'
C:/source/fe/lib/tasks/overridegems.rake:15
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:617:in `call'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:617:in `execute'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:612:in `each'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:612:in `execute'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:578:in `invoke_with_call_chain'
c:/ruby/lib/ruby/1.8/monitor.rb:242:in `synchronize'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:571:in `invoke_with_call_chain'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:588:in `invoke_prerequisites'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:585:in `each'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:585:in `invoke_prerequisites'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:577:in `invoke_with_call_chain'
c:/ruby/lib/ruby/1.8/monitor.rb:242:in `synchronize'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:571:in `invoke_with_call_chain'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:588:in `invoke_prerequisites'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:585:in `each'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:585:in `invoke_prerequisites'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:577:in `invoke_with_call_chain'
c:/ruby/lib/ruby/1.8/monitor.rb:242:in `synchronize'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:571:in `invoke_with_call_chain'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:564:in `invoke'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:2019:in `invoke_task'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:1997:in `top_level'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:1997:in `each'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:1997:in `top_level'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:2036:in `standard_exception_handling'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:1991:in `top_level'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:1970:in `run'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:2036:in `standard_exception_handling'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:1967:in `run'
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/bin/rake:31
c:/ruby/bin/rake:19:in `load'
c:/ruby/bin/rake:19
[C:\source\fe]:

有什么建议吗？我试过卸载和重新安装 rake，以及更新 rails。

仅供引用，我使用的是 Gem 1.1.1。

我还尝试了 gem update rails、gem update rake 以及其他任何东西。

Answer 1

有趣的是，这里的解决方案是我需要降级我的 rake 版本。本地版本(在我的 C:\ruby 目录中)覆盖了源目录中的版本，无法加载。我已经完成了 gem 更新并更新了我所有的本地 gem。

命令是:

gem uninstall rake
gem install rake -v ('= 1.5.1')