Fatal error: Uncaught exception 'Facebook\Exceptions\FacebookSDKException' with message 'Required "app_secret" key not supplied in config and could not find fallback environment variable "FACEBOOK_APP_SECRET"' in /var/www/vhosts/sportvision.ro/httpdocs/nb-public/lib/facebook/sdk/Facebook.php:138 Stack trace: #0 /var/www/vhosts/sportvision.ro/httpdocs/nb-public/controllers/login_facebook.php(40): Facebook\Facebook->__construct(Array) #1 /var/www/vhosts/sportvision.ro/httpdocs/nb-public/controllers/index.php(277): require_once('/var/www/vhosts...') #2 {main} thrown in /var/www/vhosts/sportvision.ro/httpdocs/nb-public/lib/facebook/sdk/Facebook.php on line 138