[Plugin: SEO Facebook Comments] Uncaught Exception: 12

Hi,

I’ve completed the App ID, App Secret , Admin ID for the SEO Facebook Comments and i get an error

Fatal error: Uncaught Exception: 12: REST API is deprecated for versions v2.1 and higher (12) thrown in /home/*******/public_html/wp-content/plugins/seo-facebook-comments/facebook/base_facebook.php on line 1273

link: https://levelswalkthrough.com/test-chamber-all-levels-1-28/
(on the bottom of the page)
Can anyone help me ?