Fatal error: Uncaught Error: Interface 'Zend_Filter_Interface' not found in C:\MANTUM\xampp2\htdocs\MNT\ventasvariables\libreria\Zend\Filter\Alnum.php:37
Stack trace:
#0 {main}
  thrown in C:\MANTUM\xampp2\htdocs\MNT\ventasvariables\libreria\Zend\Filter\Alnum.php on line 37