Hey Ivan,
For some reason the response is not interpretted as json.
I see that it contains this code:
window.fbAsyncInit = function() { FB.init({appId: '135260503194218', status: true, cookie: true, xfbml: true}); };
(function() { var e = document.createElement('script');
e.type = 'text/javascript';
e.src = document.location.protocol + '//connect.facebook.net/es_ES/all.js';
e.async = true;
document.getElementById('fb-root').appendChild(e);
}())
Did you add this into the description field? Can you remove it and see if it works?
Daniel