我在尝试运行gem命令时遇到此错误。有人知道是什么原因造成的吗？这导致我无法运行rails g migration命令(我遇到了类似的错误)，我想可能会有更多的错误。
Error loading RubyGems plugin "/Users/storwell/.rvm/gems/ruby-2.0.0-p247@global/gems/executable-hooks-1.2.2/lib/rubygems_plugin.rb": undefined method `stubs' for Gem::Specification:Class (NoMethodError)
/Users/storwell/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/site_ruby/2.0.0/rubygems/dependency.rb:255:in `matching_specs': undefined method `stubs' for Gem::Specification:Class (NoMethodError)
from /Users/storwell/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/site_ruby/2.0.0/rubygems/dependency.rb:279:in `to_specs'
from /Users/storwell/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/site_ruby/2.0.0/rubygems/dependency.rb:309:in `to_spec'
from /Users/storwell/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_gem.rb:53:in `gem'
from /Users/storwell/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/rubygems.rb:572:in `load_yaml'
from /Users/storwell/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/site_ruby/2.0.0/rubygems/config_file.rb:327:in `load_file'
from /Users/storwell/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/site_ruby/2.0.0/rubygems/config_file.rb:196:in `initialize'
from /Users/storwell/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/site_ruby/2.0.0/rubygems/gem_runner.rb:74:in `new'
from /Users/storwell/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/site_ruby/2.0.0/rubygems/gem_runner.rb:74:in `do_configuration'
from /Users/storwell/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/site_ruby/2.0.0/rubygems/gem_runner.rb:39:in `run'
from /Users/storwell/.rvm/rubies/ruby-2.0.0-p247/bin/gem:21:in `<main>'
更新：我也尝试过rake命令，但它抛出了相同的错误。
我发现了一个与相同问题相关的旧链接，看起来可能是(1)Ruby安装问题，或者(2)RubyGem问题。如果这是Ruby的问题，您需要使用RVM(Ruby版本管理器)卸载并重新安装Ruby，这似乎对一些人有效。如果是(2)RubyGem问题(可能是)，则必须删除'/Users/storewell/.rvm/gems/ruby-2.0.0-p247@global/gems/executable-hooks-1.2.2/'文件夹或更改rubygems_plugin.rb文件中的内容。
其中一位用户建议(您可以从链接中找到)：*当我使用"gem-v"时，响应会给我错误"加载RubyGems插件时出错"/Users/mercury/.rvm/gems/ruby-1.9.3-p194@global/gems/rubygems-bundler-0.2.8/lib/rubygems_plugin.rb"：无法加载此类文件--rubygems_bundler/rubygems_bundler_installer(LoadError)因此，我编辑了"rubygems_plugins.rb"，并更改了rubygems_bundler的require路径，修改后的路径为"./rubygems_bundler/｛file_name｝"，问题解决了。"*
我希望这些说明+链接能帮助你解决这个问题。去年夏天，我确实看过迈克尔·哈特尔的同一本教程书。我想我也遇到过类似的问题。我想我可能已经删除了一个文件夹来解决这个问题，也许还重新安装了一些东西(但我不是100%，因为已经有一段时间了)。
尝试调用
$gem更新--系统