Fatal error: Uncaught Error: Class "League\OAuth2\Client\Provider\AbstractProvider" not found in /home/iotechtniu/ioacademy/vendor/league/oauth2-facebook/src/Provider/Facebook.php:14 Stack trace: #0 {main} thrown in /home/iotechtniu/ioacademy/vendor/league/oauth2-facebook/src/Provider/Facebook.php on line 14