Login via Facebook

Hej alle hjælpesomme folk! :-)

Jeg er igang med et projekt, hvor jeg har et loginsystem, hvor jeg ønsker at brugeren har mulighed for at logge ind via Facebook (og så gemmer jeg deres email og facebookID, som henholdsvis user og pass session), sådan at det passer til resten af brugersystemet. Dette virker altsammen, men lige pludselig får jeg følgende fejlmeddelelse, idet at jeg forsøger at logge ind:

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Jeg har fulgt følgende tutorial:
http://asif18.com/5/facebook/facebook-login-using-php-sdk-and-javascript-sdk/

Er der nogen der har en idé om hvad det kan være?

Mvh
Henrik