Fatal error: Uncaught Error: Class "League\OAuth2\Client\Provider\AbstractProvider" not found in /opt/lampp/htdocs/forum/flarum/vendor/league/oauth2-google/src/Provider/Google.php:11 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/league/oauth2-google/src/Provider/Google.php on line 11