Ruby 1.8.x Rails 2.x 的 "uninitialized constant ActiveSupport::Dependencies::Mutex (NameError)" 錯誤

坑爹的異常。

在 Ruby 安裝目錄下的 bin 目錄下找到 rails 文件：比如：C:\Ruby187\bin
修改 rails，在 require 'rubygems' 之後加上 require 'thread'

#!C:/Ruby187/bin/ruby.exe
#
# This file was generated by RubyGems.
#
# The application 'rails' is installed as part of a gem, and
# this file is here to facilitate running it.
#
require 'thread'
require 'rubygems'

version = ">= 0"

if ARGV.first =~ /^_(.*)_$/ and Gem::Version.correct? $1 then
  version = $1
  ARGV.shift
end

gem 'rails', version
load Gem.bin_path('rails', 'rails', version)

接下來運行 rails SomeApp 生成 Rails 應用之後，再啓動rake：ruby Script/Sever 還會出上面的錯誤，則需要在
Ruby 安裝目錄下，查找 environment.rb，boot.rb 文件，同樣在前面加上 require 'thread'

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