Fatal error: Uncaught Error: Interface "Http\Promise\Promise" not found in /home/digitalproduct/public_html/projectmanagementsoftware/vendor/php-http/guzzle6-adapter/src/Promise.php:20 Stack trace: #0 {main} thrown in /home/digitalproduct/public_html/projectmanagementsoftware/vendor/php-http/guzzle6-adapter/src/Promise.php on line 20