Fatal error: Uncaught Error: Class "GuzzleHttp\Promise\RejectionException" not found in /opt/lampp/htdocs/myhospitalnow/mhn-hospital-ms/vendorback/guzzlehttp/promises/src/CancellationException.php:8 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/myhospitalnow/mhn-hospital-ms/vendorback/guzzlehttp/promises/src/CancellationException.php on line 8