Fatal error: Uncaught Error: Interface "League\OAuth1\Client\Credentials\CredentialsInterface" not found in /opt/lampp/htdocs/forum/flarum/vendor/league/oauth1-client/src/Credentials/ClientCredentialsInterface.php:5 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/league/oauth1-client/src/Credentials/ClientCredentialsInterface.php on line 5