Fatal error: Uncaught Error: Class "GuzzleHttp\Promise\RejectionException" not found in /srv/www/sites/public/starter-projects/vendor/guzzlehttp/promises/src/CancellationException.php:8 Stack trace: #0 {main} thrown in /srv/www/sites/public/starter-projects/vendor/guzzlehttp/promises/src/CancellationException.php on line 8