how to get my app go through the facebook page?

I'm not sure if my question is correct but i am having an error..at the facebook developer tools page, I provided my access token and pushed the get access token button, then I got this error

API Error Code: 191
API Error Description: The specified URL is not owned by the application
Error Message: Invalid redirect_uri: Given URL is not allowed by the Application configuration.

my site url is something like

http://www.example.com/fb/

and my domain is like

www.example.com

did i do anything wrong? and why it doesn't go through and am getting 开发者_如何学JAVAthat error ?

Looks like ou're trying to send the user, after login, to a domain other than the one configured for your app - check what you're passing into getLoginUri() if you're using the PHP SHK