Fatal error: Uncaught Error: Interface 'Zend_Http_UserAgent_Device' not found in C:\MANTUM\xampp2\htdocs\MNT\ventasvariables\libreria\Zend\Http\UserAgent\AbstractDevice.php:33 Stack trace: #0 {main} thrown in C:\MANTUM\xampp2\htdocs\MNT\ventasvariables\libreria\Zend\Http\UserAgent\AbstractDevice.php on line 33