Fatal error: Uncaught Error: Interface "GuzzleHttp\Promise\PromisorInterface" not found in E:\php8serv-x64\apps\sendnotifyios\vendor\guzzlehttp\guzzle\src\Pool.php:20 Stack trace: #0 {main} thrown in E:\php8serv-x64\apps\sendnotifyios\vendor\guzzlehttp\guzzle\src\Pool.php on line 20