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/u411710427/domains/free-seotool.com/public_html/core/library/facebook/Facebook.php:139
Stack trace:
#0 /home/u411710427/domains/free-seotool.com/public_html/core/controllers/facebook.php(38): Facebook\Facebook->__construct()
#1 /home/u411710427/domains/free-seotool.com/public_html/core/app.php(162): require('/home/u41171042...')
#2 /home/u411710427/domains/free-seotool.com/public_html/index.php(25): require('/home/u41171042...')
#3 {main}
thrown in /home/u411710427/domains/free-seotool.com/public_html/core/library/facebook/Facebook.php on line 139