Redmin/Ruby-无法加载这样的文件--io/wait（LoadError）

在Debian 7上安装Redmine 3时遇到一些问题。尽管是Debian 8版，我还是照做了。我自己编译了Ruby（v2.3.3），也编译了Ruby

每当我尝试访问redmine URL时，我都会看到一条错误消息，我在Apache2日志中发现：

[ 2016-12-02 23:15:33.7373 9218/7f42704b4700 age/

Cor/App/Implementation.cpp:304 ]: Could not spawn process for application /opt/redmine: An error occurred while starting up the preloader.
  Error ID: e27a0051
  Error details saved to: /tmp/passenger-error-LnpIIA.html
  Message from application: cannot load such file -- io/wait (LoadError)
  /usr/local/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  /usr/local/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  /usr/local/lib/ruby/2.3.0/socket.rb:4:in `<top (required)>'
  /usr/local/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  /usr/local/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  /usr/local/lib/ruby/gems/2.3.0/gems/passenger-5.0.30/src/ruby_supportlib/phusion_passenger/ruby_core_enhancements.rb:30:in `<top (required)>'
  /usr/local/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  /usr/local/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  /usr/local/lib/ruby/gems/2.3.0/gems/passenger-5.0.30/src/ruby_supportlib/phusion_passenger.rb:235:in `require_passenger_lib'
  /usr/local/lib/ruby/gems/2.3.0/gems/passenger-5.0.30/src/helper-scripts/rack-preloader.rb:77:in `init_passenger'
  /usr/local/lib/ruby/gems/2.3.0/gems/passenger-5.0.30/src/helper-scripts/rack-preloader.rb:155:in `<module:App>'
  /usr/local/lib/ruby/gems/2.3.0/gems/passenger-5.0.30/src/helper-scripts/rack-preloader.rb:30:in `<module:PhusionPassenger>'
  /usr/local/lib/ruby/gems/2.3.0/gems/passenger-5.0.30/src/helper-scripts/rack-preloader.rb:29:in `<main>'

[2016-12-02 23:15:33.7373 9218/7f42704b4700年龄/
Cor/App/Implementation.cpp:304]：无法为应用程序/opt/redmine生成进程：启动预加载程序时出错。
错误ID:e27a0051
错误详细信息保存到：/tmp/passenger-Error-LnpIIA.html
来自应用程序的消息：无法加载此类文件--io/wait（LoadError）
/usr/local/lib/ruby/site\u ruby/2.3.0/rubygems/core\u ext/kernel\u require.rb:55:in'require'
/usr/local/lib/ruby/site\u ruby/2.3.0/rubygems/core\u ext/kernel\u require.rb:55:in'require'
/usr/local/lib/ruby/2.3.0/socket.rb:4:in`'
/usr/local/lib/ruby/site\u ruby/2.3.0/rubygems/core\u ext/kernel\u require.rb:55:in'require'
/usr/local/lib/ruby/site\u ruby/2.3.0/rubygems/core\u ext/kernel\u require.rb:55:in'require'
/usr/local/lib/ruby/gems/2.3.0/gems/passenger-5.0.30/src/ruby\u supportlib/phusion\u passenger/ruby\u core\u增强。rb:30:in`'
/usr/local/lib/ruby/site\u ruby/2.3.0/rubygems/core\u ext/kernel\u require.rb:55:in'require'
/usr/local/lib/ruby/site\u ruby/2.3.0/rubygems/core\u ext/kernel\u require.rb:55:in'require'
/usr/local/lib/ruby/gems/2.3.0/gems/passenger-5.0.30/src/ruby\u supportlib/phusion\u passenger.rb:235:in“require\u passenger\u lib”
/usr/local/lib/ruby/gems/2.3.0/gems/passenger-5.0.30/src/helper scripts/rack preload.rb:77:in'init_passenger'
/usr/local/lib/ruby/gems/2.3.0/gems/passenger-5.0.30/src/helper scripts/rack preload.rb:155:in`'
/usr/local/lib/ruby/gems/2.3.0/gems/passenger-5.0.30/src/helper scripts/rack preload.rb:30:in`'
/usr/local/lib/ruby/gems/2.3.0/gems/passenger-5.0.30/src/helper scripts/rack preload.rb:29:in`'

---

因为我对Ruby和Redmine都不太熟悉，有人能告诉我如何解决这个问题吗？

可以去看看/tmp/passenger-error-LnpIIA.html中是否有有用的东西，如果你发现了什么，请把它放在这里，你是否安装了gem rubysl io wait？可以去看看/tmp/passenger-error-LnpIIA.html中是否有有用的东西，如果你发现了什么，请把它放在这里您是否安装了gem rubysl io wait？