Rubyonrails LoadError：无法加载听gem(Rails 5)

我有一个API模式的Rails 5应用程序，不允许我运行rake routes或rails s.我得到的错误是:

$ rake routes
rake aborted!
LoadError: Could not load the 'listen' gem. Add `gem 'listen'` to the development group of your Gemfile
.../config/environment.rb:5:in `<top (required)>'
LoadError: cannot load such file -- listen
.../config/environment.rb:5:in `<top (required)>'
Tasks: TOP => routes => environment
(See full trace by running task with --trace)

我已经在我的GEM文件中验证了listen在开发组中:

group :development do
  gem 'listen', '~> 3.1.5'
  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
  gem 'spring-watcher-listen', '~> 2.0.0'
end

在我的档案里.锁:

$ cat Gemfile.lock | grep 'listen'
    listen (3.1.5)
    spring-watcher-listen (2.0.0)
      listen (>= 2.7, < 4.0)
  listen (~> 3.1.5)
  spring-watcher-listen (~> 2.0.0)

我已经对bundle进行了更新，安装了bundle，并验证了gem install listen个bundle可以正常工作.本周早些时候，这是有效的，但我没有运气回go 完成我的promise .

$ ruby -v
ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-darwin14]

我看不到它在vendor/cache，但我不知道该怎么做...

$ bundle package | grep 'listen'

谢谢你的帮助！

Update:

我可以通过将gem 'listen', '~> 3.1.5'放入全局文件(并将其从:development中删除)来"修复"这个问题.然后所有的错误都消失了，一切正常，但这似乎是错误的.