Fatal error: Uncaught Error: Interface 'WPMailSMTP\Vendor\GuzzleHttp\Promise\PromiseInterface' not found in E:\www\web\wp-content\plugins\wp-mail-smtp\vendor_prefixed\guzzlehttp\promises\src\Promise.php:10
Stack trace:
#0 {main}
thrown in E:\www\web\wp-content\plugins\wp-mail-smtp\vendor_prefixed\guzzlehttp\promises\src\Promise.php on line 10