title: How to fix Ruby on Rails in OS X El Capitan
body: <p>Following this <a href="https://medium.com/@bntzio/how-to-fix-ruby-on-rails-in-os-x-el-capitan-a39af65468e1#.cfhkk718b" rel="nofollow">Medium article</a> to install Ruby on Rails for El Capitan</p>
  
  <p>When I try to install gem install rails -v 4.2.4, i get this error</p>
  
  <p><code>ERROR:  While executing gem ... (TypeError)
      no implicit conversion of nil into String</code></p>
  
  <p>Can anyone help?</p>