Fatal error: Uncaught Error: Class "Webklex\PHPIMAP\Support\Masks\AttachmentMask" not found in C:\xampp\htdocs\cms-propay\vendor\webklex\php-imap\examples\custom_attachment_mask.php:13 Stack trace: #0 {main} thrown in C:\xampp\htdocs\cms-propay\vendor\webklex\php-imap\examples\custom_attachment_mask.php on line 13