ruby on rails - Devise with omniauth-google-oauth2 gem -


I am following this tutorial:

My configuration is:

GemFile: devise.rb: 'devise', '1.5' gem 'omniauth-facebook' gem 'omniauth-google-oauth2'

But when I start the server I receive this error: 

  /. Rvm / Gemstones / Ruby-1.9.2-p290 / Gemstones / Active-Support -3.0.12 / lib / active_support / dependencies.rb: 242: `Requirement ': There is no such file to load - omniauth- Google_oauth2 (LoadError)   
 It works with Facebook, but not with Google Oauth2 GEM  
 PS: If I remove the "config.omniauth: google_oauth2" line then the server starts normally. I think that this is something from this line.  
 Any thoughts?   
 
 
 Problems updating solution da 1.5 from 1.5.3 to 1.5.3   < / Html>

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