使用带有最新 railsinstaller.org 安装程序且以前没有安装的 Windows 7 64 位计算机，当我在 Git Extensions BASH 终端中执行这些步骤时遇到问题。
我创建了一个新应用程序，使用：
rails new testapp
然后我做：
gem install foreman
它给了我：
Bad file descriptor
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/foreman-0.63.0/lib/foreman/
engine.rb:372:in `read_nonblock'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/foreman-0.63.0/lib/foreman/
engine.rb:372:in `block (2 levels) in watch_for_output'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/foreman-0.63.0/lib/foreman/
engine.rb:368:in `loop'
c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/foreman-0.63.0/lib/foreman/
engine.rb:368:in `block in watch_for_output'
20:57:01 web.1 | exited with code 0
20:57:01 system | sending SIGKILL to all processes
我应该如何开始解决这个问题？