Fatal error: Uncaught Error: Class 'GuzzleHttp\Promise\RejectionException' not found in /var/www/html/test-project/my-app/vendor/guzzlehttp/promises/src/AggregateException.php:10 Stack trace: #0 {main} thrown in /var/www/html/test-project/my-app/vendor/guzzlehttp/promises/src/AggregateException.php on line 10