Fatal error: Uncaught Error: Class 'WPMailSMTP\Vendor\GuzzleHttp\Promise\RejectionException' not found in E:\www\web\wp-content\plugins\wp-mail-smtp\vendor_prefixed\guzzlehttp\promises\src\CancellationException.php:8 Stack trace: #0 {main} thrown in E:\www\web\wp-content\plugins\wp-mail-smtp\vendor_prefixed\guzzlehttp\promises\src\CancellationException.php on line 8