Fatal error: Uncaught Error: Class 'Zend_Service_Amazon_Authentication' not found in C:\MANTUM\xampp2\htdocs\MNT\ventasvariables\libreria\Zend\Service\Amazon\Authentication\V1.php:39 Stack trace: #0 {main} thrown in C:\MANTUM\xampp2\htdocs\MNT\ventasvariables\libreria\Zend\Service\Amazon\Authentication\V1.php on line 39