Using meteor's accounts-facebook, i get a url error


I set the url for my app as http://localhost:3000 and I get this error

Can’t Load URL: The domain of this URL isn’t included in the app’s domains. To be able to load this URL, add all domains and subdomains of your app to the App Domains field in your app settings.

my app domain is empty, since fb doesnt let me set it to localhost:3000

I’m totally lost…