Ruby on rails 运行时出现语法错误"；新铁路"；

当我尝试通过运行以下命令创建新项目时：

rails new app 

我收到以下错误消息：

/usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:121:in `require': /usr/lib/ruby/vendor_ruby/did_you_mean/spell_checkers/method_name_checker.rb:9: syntax error, unexpected '.' (SyntaxError)
      @has_args    = !exception.args&.empty?
                                      ^
    from /usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:121:in `require'
    from /usr/lib/ruby/vendor_ruby/did_you_mean.rb:6:in `<top (required)>'
    from /usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:121:in `require'
    from /usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:121:in `require'
    from /var/lib/gems/2.2.0/gems/thor-0.20.3/lib/thor/error.rb:4:in `<class:Thor>'
    from /var/lib/gems/2.2.0/gems/thor-0.20.3/lib/thor/error.rb:1:in `<top (required)>'
    from /usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:69:in `require'
    from /usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:69:in `require'
    from /var/lib/gems/2.2.0/gems/thor-0.20.3/lib/thor/base.rb:4:in `<top (required)>'
    from /usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:69:in `require'
    from /usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:69:in `require'
    from /var/lib/gems/2.2.0/gems/thor-0.20.3/lib/thor.rb:2:in `<top (required)>'
    from /usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:121:in `require'
    from /usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:121:in `require'
    from /var/lib/gems/2.2.0/gems/railties-5.1.4/lib/rails/command.rb:7:in `<top (required)>'
    from /usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:69:in `require'
    from /usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:69:in `require'
    from /var/lib/gems/2.2.0/gems/railties-5.1.4/lib/rails/cli.rb:10:in `<top (required)>'
    from /usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:69:in `require'
    from /usr/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:69:in `require'
    from /var/lib/gems/2.2.0/gems/railties-5.1.4/exe/rails:9:in `<top (required)>'
    from /usr/local/bin/rails:23:in `load'
    from /usr/local/bin/rails:23:in `<main>'

/usr/lib/ruby/2.2.0/rubygems/core\u ext/kernel\u require.rb:121:in'require'：/usr/lib/ruby/vendor\u ruby/did\u你的意思是/spell\u checkers/method\u name\u checker.rb:9:语法错误，意外'。（语法错误）
@has_args=！异常。args和。空？
^
来自/usr/lib/ruby/2.2.0/rubygems/core\u ext/kernel\u require.rb:121:in'require'
从/usr/lib/ruby/vendor\u ruby/dod\u你的意思是什么。rb:6:in`'
来自/usr/lib/ruby/2.2.0/rubygems/core\u ext/kernel\u require.rb:121:in'require'
来自/usr/lib/ruby/2.2.0/rubygems/core\u ext/kernel\u require.rb:121:in'require'
from/var/lib/gems/2.2.0/gems/thor-0.20.3/lib/thor/error.rb:4:in`'
from/var/lib/gems/2.2.0/gems/thor-0.20.3/lib/thor/error.rb:1:in`'
来自/usr/lib/ruby/2.2.0/rubygems/core\u ext/kernel\u require.rb:69:in'require'
来自/usr/lib/ruby/2.2.0/rubygems/core\u ext/kernel\u require.rb:69:in'require'
from/var/lib/gems/2.2.0/gems/thor-0.20.3/lib/thor/base.rb:4:in`'
来自/usr/lib/ruby/2.2.0/rubygems/core\u ext/kernel\u require.rb:69:in'require'
来自/usr/lib/ruby/2.2.0/rubygems/core\u ext/kernel\u require.rb:69:in'require'
from/var/lib/gems/2.2.0/gems/thor-0.20.3/lib/thor.rb:2:in`'
来自/usr/lib/ruby/2.2.0/rubygems/core\u ext/kernel\u require.rb:121:in'require'
来自/usr/lib/ruby/2.2.0/rubygems/core\u ext/kernel\u require.rb:121:in'require'
来自/var/lib/gems/2.2.0/gems/railties-5.1.4/lib/rails/command.rb:7:in`'
来自/usr/lib/ruby/2.2.0/rubygems/core\u ext/kernel\u require.rb:69:in'require'
来自/usr/lib/ruby/2.2.0/rubygems/core\u ext/kernel\u require.rb:69:in'require'
从/var/lib/gems/2.2.0/gems/railties-5.1.4/lib/rails/cli.rb:10:in`'
来自/usr/lib/ruby/2.2.0/rubygems/core\u ext/kernel\u require.rb:69:in'require'
来自/usr/lib/ruby/2.2.0/rubygems/core\u ext/kernel\u require.rb:69:in'require'
从/var/lib/gems/2.2.0/gems/railties-5.1.4/exe/rails:9:in`'
from/usr/local/bin/rails:23:in'load'
from/usr/local/bin/rails:23:in`'

---

我不知道发生了什么事。这是什么？

尝试使用rvm，然后安装rails

rvm install 2.5.0

---

参考资料：

安全导航操作符

&.

在Ruby<2.3中无效。您正在使用Ruby 2.2。这就是语法错误的原因。

尝试重新安装ruby，然后再安装rails，然后尝试，会发生什么？将ruby升级到至少2.3，这时添加了安全导航操作符（

&.

）：为什么现在安装ruby 2.5.0？它既不是

&.

所需的最旧版本，也不是可用的最新版本。我已经在本地系统中尝试了rails新应用程序。它工作得很好。所以我建议。