[Plugin: Facebook Comments for WordPress] Errore when hiting the like button

Hello,

I have the Facebook-comments-for-WordPress plugin installed in all my websites and my customer sites and when I push the like button I received the Error message:
The app ID specified within the “fb:app_id” meta tag is not allowed on this domain. You must setup the Connect Base Domains for your app to be a prefix of http://www.sitename.co.il/page-name.

I rechecked the application info and everything is ok.
Some of the websites are old and the Facebook-comments-for-WordPress plugin is running for some time now (till now with no problem) yet I experiencing the same problem.

I’d like to find a solution other than changing the plugin.

Thanks
Eytan

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