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 /homepages/17/d914678062/htdocs/core/library/facebook/Facebook.php:139 Stack trace: #0 /homepages/17/d914678062/htdocs/core/controllers/facebook.php(38): Facebook\Facebook->__construct() #1 /homepages/17/d914678062/htdocs/core/app.php(162): require('/homepages/17/d...') #2 /homepages/17/d914678062/htdocs/index.php(26): require('/homepages/17/d...') #3 {main} thrown in /homepages/17/d914678062/htdocs/core/library/facebook/Facebook.php on line 139