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/amzpuls/public_html/lib/facebook/Facebook.php:139 Stack trace: #0 /home/amzpuls/public_html/index.php(42): Facebook\Facebook->__construct(Array) #1 {main} thrown in /home/amzpuls/public_html/lib/facebook/Facebook.php on line 139