由于独角兽，bundle exec rails s 失败答案

【问题标题】：bundle exec rails s failed because of unicorn由于独角兽，bundle exec rails s 失败
【发布时间】：2017-01-29 09:36:00
【问题描述】：

我在环境中使用 ubuntu 16.04 和 rbenv。成功安装捆绑包后，我尝试使用bundle exec rails s 启动服务器，但出现以下错误

/home/mario/prayer-portal/vendor/bundle/ruby/2.1.0/gems/unicorn-5.1.0/lib/unicorn/const.rb:21:in `require_relative': cannot load such file -- /home/mario/prayer-portal/vendor/bundle/ruby/2.1.0/gems/unicorn-5.1.0/lib/unicorn/version (LoadError)
    from /home/mario/prayer-portal/vendor/bundle/ruby/2.1.0/gems/unicorn-5.1.0/lib/unicorn/const.rb:21:in `<top (required)>'
    from /home/mario/prayer-portal/vendor/bundle/ruby/2.1.0/gems/unicorn-5.1.0/lib/unicorn.rb:122:in `require_relative'
    from /home/mario/prayer-portal/vendor/bundle/ruby/2.1.0/gems/unicorn-5.1.0/lib/unicorn.rb:122:in `block in <top (required)>'
    from /home/mario/prayer-portal/vendor/bundle/ruby/2.1.0/gems/unicorn-5.1.0/lib/unicorn.rb:121:in `each'
    from /home/mario/prayer-portal/vendor/bundle/ruby/2.1.0/gems/unicorn-5.1.0/lib/unicorn.rb:121:in `<top (required)>'
    from /home/mario/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/bundler-1.14.3/lib/bundler/runtime.rb:91:in `require'
    from /home/mario/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/bundler-1.14.3/lib/bundler/runtime.rb:91:in `block (2 levels) in require'
    from /home/mario/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/bundler-1.14.3/lib/bundler/runtime.rb:86:in `each'
    from /home/mario/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/bundler-1.14.3/lib/bundler/runtime.rb:86:in `block in require'
    from /home/mario/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/bundler-1.14.3/lib/bundler/runtime.rb:75:in `each'
    from /home/mario/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/bundler-1.14.3/lib/bundler/runtime.rb:75:in `require'
    from /home/mario/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/gems/bundler-1.14.3/lib/bundler.rb:107:in `require'
    from /home/mario/prayer-portal/config/application.rb:7:in `<top (required)>'
    from /home/mario/prayer-portal/vendor/bundle/ruby/2.1.0/gems/railties-4.1.16/lib/rails/commands/commands_tasks.rb:79:in `require'
    from /home/mario/prayer-portal/vendor/bundle/ruby/2.1.0/gems/railties-4.1.16/lib/rails/commands/commands_tasks.rb:79:in `block in server'
    from /home/mario/prayer-portal/vendor/bundle/ruby/2.1.0/gems/railties-4.1.16/lib/rails/commands/commands_tasks.rb:76:in `tap'
    from /home/mario/prayer-portal/vendor/bundle/ruby/2.1.0/gems/railties-4.1.16/lib/rails/commands/commands_tasks.rb:76:in `server'
    from /home/mario/prayer-portal/vendor/bundle/ruby/2.1.0/gems/railties-4.1.16/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
    from /home/mario/prayer-portal/vendor/bundle/ruby/2.1.0/gems/railties-4.1.16/lib/rails/commands.rb:17:in `<top (required)>'
    from bin/rails:4:in `require'
    from bin/rails:4:in `<main>'

【问题讨论】：

标签： ruby-on-rails ruby ubuntu rubygems bundle

【解决方案1】：

尝试通过“sudo bundle exec gem uninstall unicorn”卸载 gem，然后通过标准的“sudo bundle install”重新安装。它将更新独角兽版本。

【讨论】：