Ruby on rails 无法在rails 5中启动rails服务器

我使用RVM安装了Rails。一切正常，就像使用

railsnewapp

生成一个新应用一样

bundle安装

和其他每一个命令都可以正常运行。 但是当我用

Rails-server

启动Rails服务器时，我得到了以下错误，我无法理解

rails aborted!
NameError: undefined local variable or method `rver' for #<Rake::Application:0x00563aa7540988>
/home/mrrobot/.rvm/gems/ruby-2.4.0@global/gems/railties-5.0.2/lib/rails/commands/rake_proxy.rb:12:in `block in run_rake_task'
/home/mrrobot/.rvm/gems/ruby-2.4.0@global/gems/railties-5.0.2/lib/rails/commands/rake_proxy.rb:11:in `run_rake_task'
/home/mrrobot/.rvm/gems/ruby-2.4.0@global/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:51:in `run_command!'
/home/mrrobot/.rvm/gems/ruby-2.4.0@global/gems/railties-5.0.2/lib/rails/commands.rb:18:in `<top (required)>'
/home/mrrobot/rails/demo/app/bin/rails:9:in `require'
/home/mrrobot/rails/demo/app/bin/rails:9:in `<top (required)>'
/home/mrrobot/.rvm/gems/ruby-2.4.0@global/gems/spring-2.0.1/lib/spring/client/rails.rb:28:in `load'
/home/mrrobot/.rvm/gems/ruby-2.4.0@global/gems/spring-2.0.1/lib/spring/client/rails.rb:28:in `call'
/home/mrrobot/.rvm/gems/ruby-2.4.0@global/gems/spring-2.0.1/lib/spring/client/command.rb:7:in `call'
/home/mrrobot/.rvm/gems/ruby-2.4.0@global/gems/spring-2.0.1/lib/spring/client.rb:30:in `run'
/home/mrrobot/.rvm/gems/ruby-2.4.0@global/gems/spring-2.0.1/bin/spring:49:in `<top (required)>'
/home/mrrobot/.rvm/gems/ruby-2.4.0@global/gems/spring-2.0.1/lib/spring/binstub.rb:31:in `load'
/home/mrrobot/.rvm/gems/ruby-2.4.0@global/gems/spring-2.0.1/lib/spring/binstub.rb:31:in `<top (required)>'
/home/mrrobot/rails/demo/app/bin/spring:15:in `require'
/home/mrrobot/rails/demo/app/bin/spring:15:in `<top (required)>'
bin/rails:3:in `load'
bin/rails:3:in `<main>'
(See full trace by running task with --trace)

rails中止！
NameError:未定义的局部变量或方法“server”#
/home/mrrobot/.rvm/gems/ruby-2.4。0@global/gems/railties-5.0.2/lib/rails/commands/rake\u proxy.rb:12:in'block in run\u rake\u task'
/home/mrrobot/.rvm/gems/ruby-2.4。0@global/gems/railties-5.0.2/lib/rails/commands/rake\u proxy.rb:11:in'run\u rake\u task'
/home/mrrobot/.rvm/gems/ruby-2.4。0@global/gems/railties-5.0.2/lib/rails/commands/commands\u tasks.rb:51:in'run\u command！'
/home/mrrobot/.rvm/gems/ruby-2.4。0@global/gems/railties-5.0.2/lib/rails/commands.rb:18:in`'
/home/mrrobot/rails/demo/app/bin/rails:9:in'require'
/home/mrrobot/rails/demo/app/bin/rails:9:in`'
/home/mrrobot/.rvm/gems/ruby-2.4。0@global/gems/spring-2.0.1/lib/spring/client/rails.rb:28:in'load'
/home/mrrobot/.rvm/gems/ruby-2.4。0@global/gems/spring-2.0.1/lib/spring/client/rails.rb:28:in'call'
/home/mrrobot/.rvm/gems/ruby-2.4。0@global/gems/spring-2.0.1/lib/spring/client/command.rb:7:in'call'
/home/mrrobot/.rvm/gems/ruby-2.4。0@global/gems/spring-2.0.1/lib/spring/client.rb:30:in'run'
/home/mrrobot/.rvm/gems/ruby-2.4。0@global/gems/spring-2.0.1/bin/spring:49:in`'
/home/mrrobot/.rvm/gems/ruby-2.4。0@global/gems/spring-2.0.1/lib/spring/binstub.rb:31:in'load'
/home/mrrobot/.rvm/gems/ruby-2.4。0@global/gems/spring-2.0.1/lib/spring/binstub.rb:31:in`'
/home/mrrobot/rails/demo/app/bin/spring:15:in'require'
/home/mrrobot/rails/demo/app/bin/spring:15:in`'
箱子/轨道：3:在“装载”中
箱子/轨道：3:in`'
（通过使用--trace运行任务查看完整跟踪）

Ruby版本：2.4.0p0（2016-12-24修订版57164）[x86_64-linux]

Rails版本：5.0.2

---

RubyGems版本：2.6.11

它是

rails服务器

，没有破折号

或者只是

rails s

---

是的，它工作了，但是我想知道下面的命令做什么“rails-server”没有

-server

选项错误不是安静的描述命令不正确。如果运行

rails--help

，您可以看到所有可用的选项