Fatal error: Uncaught Error: Class "GuzzleHttp\Promise\RejectionException" not found in /home/php8crons/public_html/xpert/includes/selling-partner-api-main/vendor/guzzlehttp/promises/src/CancellationException.php:8 Stack trace: #0 {main} thrown in /home/php8crons/public_html/xpert/includes/selling-partner-api-main/vendor/guzzlehttp/promises/src/CancellationException.php on line 8