创业板安装-v 4.2.4无法安装

Question

运行此命令时，我收到以下错误消息导轨：

gem install rails -v 4.2.4 

这是错误：

/Users/adamgoldberg/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/yaml.rb:5:in `<top (required)>': 
It seems your ruby installation is missing psych (for YAML output). 
To eliminate this warning, please install libyaml and reinstall your ruby. 
/Users/adamgoldberg/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require': dlopen(/Users/adamgoldberg/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/x86_64-darwin15/psych.bundle, 9): Library not loaded: /usr/local/opt/libyaml/lib/libyaml-0.2.dylib (LoadError) 
    Referenced from: /Users/adamgoldberg/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/x86_64-darwin15/psych.bundle 
    Reason: image not found - /Users/adamgoldberg/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/x86_64-darwin15/psych.bundle 
    from /Users/adamgoldberg/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require' 
    from /Users/adamgoldberg/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/psych.rb:7:in `<top (required)>' 
    from /Users/adamgoldberg/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require' 
    from /Users/adamgoldberg/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require' 
    from /Users/adamgoldberg/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/yaml.rb:6:in `<top (required)>' 
    from /Users/adamgoldberg/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require' 
    from /Users/adamgoldberg/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require' 
    from /Users/adamgoldberg/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems.rb:628:in `load_yaml' 
    from /Users/adamgoldberg/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/config_file.rb:326:in `load_file' 
    from /Users/adamgoldberg/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/config_file.rb:198:in `initialize' 
    from /Users/adamgoldberg/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/gem_runner.rb:75:in `new' 
    from /Users/adamgoldberg/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/gem_runner.rb:75:in `do_configuration' 
    from /Users/adamgoldberg/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/gem_runner.rb:40:in `run' 
    from /Users/adamgoldberg/.rvm/rubies/ruby-2.3.0/bin/gem:21:in `<main>' 

请帮助 - 这是造成我的噩梦

Answer 1

错误本身明确地说，你应该先安装libyaml，然后重新安装你的红宝石。你可以通过运行以下命令来完成。

sudo apt-get install libtool 

rvm package install libyaml 

rvm reinstall ruby-2.3.0 

更多参考请参阅this answer

Answer 2

It seems your ruby installation is missing psych (for YAML output).

与自制安装libyaml：http://brew.sh;然后尝试gem install rails -v 4.2.4

 
$ brew info libyaml 
libyaml: stable 0.1.6 (bottled) 
YAML Parser 
http://pyyaml.org/wiki/LibYAML 
Not installed 
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/libyaml.rb 
==> Options 
--universal 
    Build a universal binary 

$ brew install libyaml 
==> Downloading https://homebrew.bintray.com/bottles/libyaml-0.1.6_1.el_capitan.bottle.tar.gz 
######################################################################## 100.0% 
==> Pouring libyaml-0.1.6_1.el_capitan.bottle.tar.gz 
    /usr/local/Cellar/libyaml/0.1.6_1: 8 files, 312.8K 

---

重新安装RUBY

如果上述解决方案不适合你从头与RVM或rbenv工作，重新安装红宝石，

1）试试接受的答案：https://stackoverflow.com/a/38194139/1076207

- 或 -

2）删除所有RVM文件，然后重新安装RVM：https://stackoverflow.com/a/38158619/1076207

- 或 -

3）删除所有RVM文件，然后安装rbenv：https://stackoverflow.com/a/38194231/1076207

以上使用的三个选项之一之后，使用http://bundler.io安装Rails：

 
$ mkdir ~/Documents/Repo 
$ cd ~/Documents/Repo 
$ gem install bundler 
[…] 
$ bundle init 
Writing new Gemfile to /Users/username/Documents/Repo/Gemfile 
$ echo "gem 'rails', '4.2.4'" >> Gemfile 
$ bundle install 
[…] 
$ bundle exec rails new project_name 
[…] 
$ cd project_name 

就个人而言，我推荐3）切换到rbenv-I那样。