Hello,
I checked your site and it seems that the Facebook account that you were using was limited from accessing the page you wish to import.
Because of this, I updated the plugin, added the ‘Timeout Between Facebook Page Requests’ settings field to importing rule settings, and set it’s default value to 2000. This means, that the plugin will wait 2 seconds between each consecutive request it makes, so the account you use will not be limited any more.
I also added my own cookie values in plugin settings, and with them, importing worked correctly.
Please enter a pair of cookie values from a new Facebook account (I suggest you create a new account for this purpose) into the plugin settings.
Right now, I deleted my cookies values, importing will not work until you do not add cookies in plugin settings.
Regards.