I try to use omniauth to authenticate with facebook account, as in Ryan
Bates tutorial http://railscasts.com/episodes/235-omniauth-part-1.
I have followed all steps in that tutorial.
When point my browser to http://localhost:3000/auth/facebook it indeed
redirects me to facebook to login. But on callback, instead of being
redirected to my url, I receive this error http://pastie.org/1588879
Can somebody help me please?