Fatal error: Uncaught Error: Class 'WPMailSMTP\Providers\MailerAbstract' not found in C:\xampp\htdocs\wp-content\plugins\wp-mail-smtp\src\Providers\SMTP2GO\Mailer.php:14 Stack trace: #0 {main} thrown in C:\xampp\htdocs\wp-content\plugins\wp-mail-smtp\src\Providers\SMTP2GO\Mailer.php on line 14