Fatal error: Uncaught Error: Class 'PHPMailer\PHPMailer\PHPMailer' not found in C:\xampp\htdocs\school\care\wp-includes\class-wp-phpmailer.php:16 Stack trace: #0 {main} thrown in C:\xampp\htdocs\school\care\wp-includes\class-wp-phpmailer.php on line 16