title: uninitialized constant error, while using JSON and Facebook connect with rails
body: <p>I'm following the tutorial here
  <a href="http://applicake.com/posts/54-integrating-facebook-connect-with-rails-applications" rel="nofollow noreferrer">http://applicake.com/posts/54-integrating-facebook-connect-with-rails-applications</a></p>
  
  <p>to set up facebook connect.  It almost worked, except for the last step :-(
  I'm getting a JSON error, inspite of installing the JSON plugin. </p>
  
  <p>I did gem install json</p>
  
  <p>How do I fix the problem?</p>
  
  <p>Error in the view:
  uninitialized constant SessionsController::JSON</p>
  
  <p>Error on the console:
  NameError (uninitialized constant SessionsController::JSON):</p>