Fatal error: Uncaught exception 'Facebook\Exceptions\FacebookSDKException' with message 'Required "app_id" key not supplied in config and could not find fallback environment variable "FACEBOOK_APP_ID"' in /home/learnseoeasily/public_html/core/library/facebook/Facebook.php:139 Stack trace: #0 /home/learnseoeasily/public_html/core/controllers/facebook.php(37): Facebook\Facebook->__construct(Array) #1 /home/learnseoeasily/public_html/core/app.php(192): require('/home/learnseoe...') #2 /home/learnseoeasily/public_html/index.php(31): require('/home/learnseoe...') #3 {main} thrown in /home/learnseoeasily/public_html/core/library/facebook/Facebook.php on line 139