I'm not sure why you have the {SCFacebookPagePlugin} tag by itself. You should remove that as it won't function without any parameters.
As for the update, Facebook updated the tags for the Page Plugin. Please update your code to:
{SCFacebookPagePlugin height=600 width=400 href=https://www.facebook.com/RichmondCountyNS show_faces=true hide_cover=false tabs=timeline}
I hope that helps, but if you need anything else, just let us know.
Thanks,
Alex