tcp_server.rb:18:in `unpack_sockaddr_in'：没有将 nil 隐式转换为字符串 (TypeError)答案

【问题标题】：tcp_server.rb:18:in `unpack_sockaddr_in': no implicit conversion of nil into String (TypeError)tcp_server.rb:18:in `unpack_sockaddr_in'：没有将 nil 隐式转换为字符串 (TypeError)
【发布时间】：2019-08-25 07:14:19
【问题描述】：

我正在 Windows 系统上设置 Redmine 4.0.3，ruby 2.5.1，瘦服务器。安装成功，但是当我尝试启动 Redmine 时发生错误并且瘦服务器没有启动。这是发生了什么的跟踪日志：

Thin web server (v1.7.2 codename Bachmanity)
Maximum connections set to 1024
Listening on 0.0.0.0:3000, CTRL+C to stop
Traceback (most recent call last):
        20: from C:/Ruby25/bin/thin:23:in `<main>'
        19: from C:/Ruby25/bin/thin:23:in `load'
        18: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/thin-1.7.2/bin/thin:6:in `<top (required)>'
        17: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/thin-1.7.2/lib/thin/runner.rb:159:in `run!'
        16: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/thin-1.7.2/lib/thin/runner.rb:203:in `run_command'
        15: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/thin-1.7.2/lib/thin/controllers/controller.rb:87:in `start'
        14: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/thin-1.7.2/lib/thin/server.rb:162:in `start'
        13: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/thin-1.7.2/lib/thin/backends/base.rb:73:in `start'
        12: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/eventmachine-1.2.7-x86-mingw32/lib/eventmachine.rb:196:in `run'
        11: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/eventmachine-1.2.7-x86-mingw32/lib/em/pure_ruby.rb:144:in `run_machine'
        10: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/eventmachine-1.2.7-x86-mingw32/lib/em/pure_ruby.rb:547:in `run'
         9: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/eventmachine-1.2.7-x86-mingw32/lib/em/pure_ruby.rb:547:in `loop'
         8: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/eventmachine-1.2.7-x86-mingw32/lib/em/pure_ruby.rb:551:in `block in run'
         7: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/eventmachine-1.2.7-x86-mingw32/lib/em/pure_ruby.rb:568:in `run_timers'
         6: from C:/Ruby25/lib/ruby/2.5.0/set.rb:774:in `each'
         5: from C:/Ruby25/lib/ruby/2.5.0/set.rb:774:in `each'
         4: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/eventmachine-1.2.7-x86-mingw32/lib/em/pure_ruby.rb:571:in `block in run_timers'
         3: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/eventmachine-1.2.7-x86-mingw32/lib/eventmachine.rb:1546:in `event_callback'
         2: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/thin-1.7.2/lib/thin/backends/base.rb:63:in `block in start'
         1: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/thin-1.7.2/lib/thin/backends/tcp_server.rb:18:in `connect'
C:/Ruby25/lib/ruby/gems/2.5.0/gems/thin-1.7.2/lib/thin/backends/tcp_server.rb:18:in `unpack_sockaddr_in': no implicit conversion of nil into String (TypeError)

我不知道该错误的原因是什么。我必须改变什么才能启动瘦服务器？

【问题讨论】：

puma server 成功启动Redmine ...

标签： ruby-on-rails ruby thin eventmachine

【解决方案1】：

删除所有版本的eventmachine，然后：

gem 安装事件机器

【讨论】：