Fatal error: Uncaught Error: Interface "GuzzleHttp\Promise\PromiseInterface" not found in /home/v2appclykk/public_html/mail_manager/vendor/guzzlehttp/promises/src/Promise.php:14 Stack trace: #0 {main} thrown in /home/v2appclykk/public_html/mail_manager/vendor/guzzlehttp/promises/src/Promise.php on line 14