Fatal error: Uncaught Error: Interface 'Zend_Validate_Interface' not found in C:\MANTUM\xampp2\htdocs\MNT\ventasvariables\libreria\Zend\Form\Element.php:43 Stack trace: #0 {main} thrown in C:\MANTUM\xampp2\htdocs\MNT\ventasvariables\libreria\Zend\Form\Element.php on line 43