Fatal error: Uncaught Error: Class 'WPMailSMTP\Admin\PageAbstract' not found in E:\www\web\wp-content\plugins\wp-mail-smtp\src\Admin\Pages\AboutTab.php:14 Stack trace: #0 {main} thrown in E:\www\web\wp-content\plugins\wp-mail-smtp\src\Admin\Pages\AboutTab.php on line 14