facebook connect in rails

I connect with facebook and then register in my site or connect with twitter. When i try connect to facebook login show this error:

Invalid Argument
Given URL is not allowed by the Application configuration.

I believe that the cause are the session because i don´t lo开发者_运维技巧g out of facebook connect.

You need to change your application URL in your application settings on facebook.

This is via www.facebook.com/developers Select your app, Edit settings, change the website URL.

If you are developing on localhost, change it to http://localhost:3000 or whatever your server is running on.