Fatal Error Custom field in address

[carolinepgm1]

Hey, 

I had insert an custom field following this tutorial (http://www.bitsandchips.it/forum/viewtopic.php?f=11&t=4884)

But, when I try to register an address, I have this error on the field that I had insert:

 

Fatal error: Call to undefined method Validate::isNumero() in /classes/ObjectModel.php on line 1030

 

On line 1030:

if (isset($data['validate']) && !Validate::$data['validate']($value) && (!empty($value) || $data['required']))

$errors[$field] = '<b>'.self::displayFieldName($field, get_class($this), $htmlentities).'</b> '.Tools::displayError('is invalid.');

 

"Numero" is what I had insert

Sorry for English. 

 

I'm using Prestashop 1.5.6

Edited April 2, 2014 by carolinepgm1 (see edit history)