标签: ruby rubygems ruby-on-rails-5
我正在尝试运行我的黄瓜测试,但是我收到了这个错误:
can't dup NilClass (TypeError) /Users/jeffreyyong/.rbenv/versions/2.4.0-preview1/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/utils.rb:40:in `dup'
问题的根源是什么以及如何调试?