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 /www/doc/www.certovskezlavy.sk/www/libs/facebook/graph-sdk/src/Facebook/Facebook.php:142 Stack trace: #0 /www/doc/www.certovskezlavy.sk/www/include/facebook/login.php(10): Facebook\Facebook->__construct(Array) #1 {main} thrown in /www/doc/www.certovskezlavy.sk/www/libs/facebook/graph-sdk/src/Facebook/Facebook.php on line 142