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/vinaritrade.com/4_done/php_mysql/sys/facebook/Facebook.php:139 Stack trace: #0 /home/vinaritrade.com/4_done/php_mysql/fb_login.php(12): Facebook\Facebook->__construct(Array) #1 {main} thrown in /home/vinaritrade.com/4_done/php_mysql/sys/facebook/Facebook.php on line 139