Fatal error: Uncaught Error: Interface 'League\OAuth2\Client\Grant\GrantInterface' not found in /home/opcon/src/dat/lib/vendor/league/oauth2-client/src/Grant/ClientCredentials.php:7 Stack trace: #0 {main} thrown in /home/opcon/src/dat/lib/vendor/league/oauth2-client/src/Grant/ClientCredentials.php on line 7