Fatal error: Uncaught Error: Interface 'WPMailSMTP\Vendor\GuzzleHttp\Promise\PromiseInterface' not found in C:\xampp\htdocs\wp-content\plugins\wp-mail-smtp\vendor_prefixed\guzzlehttp\promises\src\Promise.php:13 Stack trace: #0 {main} thrown in C:\xampp\htdocs\wp-content\plugins\wp-mail-smtp\vendor_prefixed\guzzlehttp\promises\src\Promise.php on line 13