I am trying to put Facebook Login button on Codeigniter platform.
I have followed this procedure
http://www.dannyherran.com/2011/02/facebook-php-sdk-and-codeigniter-for-basic-user-authentication/
but I got this error
API Error Code: 100
API Error Description: Invalid parameter
Error Message: Requires valid redirect URI.
I used exactly same code that the website provided.
Can you tell me why I get this error message?