Fatal error: Uncaught Facebook\Exceptions\FacebookSDKException: Required "app_id" key not supplied in config and could not find fallback environment variable "FACEBOOK_APP_ID" in /home/teresinadiario/www/facebook/facebook-php-sdk/Facebook.php:139 Stack trace: #0 /home/teresinadiario/www/facebook/index.php(24): Facebook\Facebook->__construct(Array) #1 {main} thrown in /home/teresinadiario/www/facebook/facebook-php-sdk/Facebook.php on line 139