Fatal error: Uncaught Error: Interface 'WPMailSMTP\Vendor\GuzzleHttp\Promise\PromiseInterface' not found in D:\www\wordpress - 安裝環境+外掛測試\02.外掛程式\常用外掛\wp-mail-smtp\vendor_prefixed\guzzlehttp\promises\src\Promise.php:13 Stack trace: #0 {main} thrown in D:\www\wordpress - 安裝環境+外掛測試\02.外掛程式\常用外掛\wp-mail-smtp\vendor_prefixed\guzzlehttp\promises\src\Promise.php on line 13