ruby on rails - Why does gibbon throw 'uninitialized constant Gibbon::API (NameError)' -

I'm trying to add a Rail 3.2 app.

I have followed the instructions, and set a gibbon.rb initializer with the following

  Gibbon :: API.api_key = ENV ["MAILCHIMP_API_KEY"] Gibbon: : API.timeout = 15 Gibbon :: API.throws_exceptions =   
 Throwing app  
  uninitialized Continuous Gibbon :: API (NameError)   
 I have tried  among other things,  is required, but nothing is working.  
 Why the class has not started?   
 
 
 exits I was using the wrong version of the gem.  
 Github is a shining new version 0.5, while Ruby Gams still v. 0.4 is at.  
  Installation from git: 'git: //github.com/amro/gibbon.git'  Resolved Everything!  
 Facepam!