Gem 的未定义方法‘ source_index’: Module (NoMethodError)

我正在运行一个 Rails 2.3.5应用程序，在运行 script/server 时，我看到了以下内容:

./script/../config/../vendor/rails/railties/lib/rails/gem_dependency.rb:21:in `add_frozen_gem_path': undefined method `source_index' for Gem:Module (NoMethodError)
from ./script/../config/boot.rb:60:in `load_initializer'
from ./script/../config/boot.rb:44:in `run'
from ./script/../config/boot.rb:17:in `boot!'
from ./script/../config/boot.rb:123
from script/server:2:in `require'
from script/server:2

如果我在 boot.rb 中注释掉第60行(Rails: : GemDependency.add _ zen _ gem _ path)并运行 script/server，我会得到:

=> Booting WEBrick
=> Rails 2.3.5 application starting on http://0.0.0.0:3000
./script/../config/../vendor/rails/railties/lib/rails/gem_dependency.rb:21:in `add_frozen_gem_path': undefined method `source_index' for Gem:Module (NoMethodError)
from ./script/../config/../vendor/rails/railties/lib/initializer.rb:298:in `add_gem_load_paths'
from ./script/../config/../vendor/rails/railties/lib/initializer.rb:132:in `process'
from ./script/../config/../vendor/rails/railties/lib/initializer.rb:113:in `send'
from ./script/../config/../vendor/rails/railties/lib/initializer.rb:113:in `run'
from /home/developer/bigpink/config/environment.rb:13
from /home/developer/bigpink/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in `require'
from /home/developer/bigpink/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in `require'
from /home/developer/bigpink/vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in `new_constants_in'
from /home/developer/bigpink/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in `require'
from /home/developer/bigpink/vendor/rails/railties/lib/commands/server.rb:84
from script/server:3:in `require'
from script/server:3

所以，我真的不知道该怎么办。希望我能得到一些快速的帮助。谢谢！