Fatal error: Uncaught Error: Interface "GuzzleHttp\Promise\PromisorInterface" not found in /home/appdemo/public_html/samena-mailer/vendor/guzzlehttp/promises/src/EachPromise.php:13 Stack trace: #0 {main} thrown in /home/appdemo/public_html/samena-mailer/vendor/guzzlehttp/promises/src/EachPromise.php on line 13