本文介绍了一种常见的Ruby on Rails开发环境中遇到的问题：指定版本的Rails gem未安装导致的错误提示。文中给出了两种解决方案：一是使用gem命令安装指定版本的Rails gem；二是修改环境配置文件environment.rb来指定所需的Rails版本。
D:\work\depot>ruby script/server
Cannot find gem for Rails =1.2.6.0:
Install the missing gem with 'gem install -v=1.2.6 rails', or
change environment.rb to define RAILS_GEM_VERSION with your desired version.
Cannot find gem for Rails =1.2.6.0:
Install the missing gem with 'gem install -v=1.2.6 rails', or
change environment.rb to define RAILS_GEM_VERSION with your desired version.
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