Fatal error: Uncaught Error: Interface 'GuzzleHttp\Promise\PromiseInterface' not found in /home/ocvaws/public_html/ovc-mailer/vendor/guzzlehttp/promises/src/FulfilledPromise.php:15 Stack trace: #0 {main} thrown in /home/ocvaws/public_html/ovc-mailer/vendor/guzzlehttp/promises/src/FulfilledPromise.php on line 15