Fatal error: Uncaught Error: Class 'Zend_Mail_Protocol_Smtp' not found in C:\MANTUM\xampp2\htdocs\MNT\ventasvariables2\libreria\Zend\Mail\Protocol\Smtp\Auth\Plain.php:39 Stack trace: #0 {main} thrown in C:\MANTUM\xampp2\htdocs\MNT\ventasvariables2\libreria\Zend\Mail\Protocol\Smtp\Auth\Plain.php on line 39