Fatal error: Uncaught Error: Interface 'WPMailSMTP\Vendor\Psr\Http\Client\ClientExceptionInterface' not found in C:\wamp64\www\wordpress\wp-content\upgrade-temp-backup\plugins\wp-mail-smtp\vendor_prefixed\psr\http-client\src\NetworkExceptionInterface.php:13 Stack trace: #0 {main} thrown in C:\wamp64\www\wordpress\wp-content\upgrade-temp-backup\plugins\wp-mail-smtp\vendor_prefixed\psr\http-client\src\NetworkExceptionInterface.php on line 13