Fatal error: Uncaught Error: Class 'WPMailSMTP\Compatibility\Plugin\PluginAbstract' not found in E:\www\web\wp-content\plugins\wp-mail-smtp\src\Compatibility\Plugin\Admin2020.php:10 Stack trace: #0 {main} thrown in E:\www\web\wp-content\plugins\wp-mail-smtp\src\Compatibility\Plugin\Admin2020.php on line 10