Can't access Events from Facebook page

Hi. I'm trying to feed the events from GoogiesArtCafe to my blog at but although it appeared to work once, it isnt updating and something now goes wrong at the Permissions step - I get this message:

"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 permitted by the application configuration."

Any ideas what might be happening?
Much obliged.