Michiel on "[Plugin: Facebook Comments Importer] Warning: Error while getting this wall : (#4) Application request limit reached"

Hi,

I have some FB wall comments that I want to import into WP. I've set those posts to public.
Now I get this error while running the plugins import function (button):

Warning: Error while getting this wall : (#4) Application request limit reached

Is this a server, plugin or facebook limit?

Thanks for any help!

Michiel

http://wordpress.org/extend/plugins/facebook-comments-importer/