Fatal error: Uncaught Error: Class "League\OAuth1\Client\Credentials\ClientCredentials" not found in /opt/lampp/htdocs/forum/flarum/vendor/league/oauth1-client/src/Credentials/RsaClientCredentials.php:7 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/league/oauth1-client/src/Credentials/RsaClientCredentials.php on line 7