[Plugin: Facebook] Red box Error

I got this error message when installing this plugin.

URL yang diberikan tidak diizinkan oleh konfigurasi Aplikasi.:
One or more of the given URLs is not allowed by the App’s settings. It must match the Website URL or Canvas URL, or the domain must be a subdomain of one of the App’s domains.

Please take a look on http://natal25desember.com (right corner)

How to resolve this problem?

http://ww.wp.xz.cn/extend/plugins/facebook/