确切的错误是:
An error occurred while installing nio4r (1.2.1), and bundler cannot continue. Make sure that 'gem install nio4r -v '1.2.1'' succeeds before bundling.
这是一个痕迹:
Fetching gem metadata from https://rubygems.org/
Fetching version metadata from https://rubygems.org/
Fetching dependency metadata from https://rubygems.org/
Using rake 12.0.0
Using concurrent-ruby 1.0.5
Using i18n 0.8.1
Using minitest 5.10.1
Using thread_safe 0.3.6
Using builder 3.2.3
Using erubis 2.7.0
Using mini_portile2 2.1.0
Using rack 2.0.1
Installing nio4r 1.2.1 with native extensions
Errno::EACCES: Permission denied @ rb_sysopen - /Users/lukeplourde/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/nio4r-1.2.1/.gitignore
Using …