title: Ruby Install JSON Error
body: <p>I'm new to Ruby, but receiving the following error, don't know what is causing the issue. 
  I've installed Ruby 1.9.2, and using RVM on Mac OS Leopard. </p>
  
  <p>Could not find multi_json (~> 1.0) amongst [actionmailer-3.1.1, actionpack-3.1.1.......uglifier-1.0.4] (Gem::LoadError)</p>
  
  <p>I'm trying to isolate the error, but wondering should I run JSON (install) gem in localfile??</p>