Fatal error: Uncaught Facebook\Exceptions\FacebookSDKException: Required "app_secret" key not supplied in config and could not find fallback environment variable "FACEBOOK_APP_SECRET" in /srv/users/serverpilot/apps/apphour/public/fb/Facebook/Facebook.php:142 Stack trace: #0 /srv/users/serverpilot/apps/apphour/public/fb/index.php(14): Facebook\Facebook->__construct(Array) #1 /srv/users/serverpilot/apps/apphour/public/index.php(8): require_once('/srv/users/serv...') #2 {main} thrown in /srv/users/serverpilot/apps/apphour/public/fb/Facebook/Facebook.php on line 142