User Model migration

hi guys,... I have a old version of script written in 1.2 pre-Beta and want to migrate to 1.3,... and have a User Model: 

<?php

class User extends AppModel {

  var $name = 'User';

  

  var $validate = array(

    'username' => '/^[a-z0-9\_\-\.]{5,40}$/i',

    'password' => VALID_NOT_EMPTY,

    'firstname' => VALID_NOT_EMPTY,

    'lastname' => VALID_NOT_EMPTY,

    'gender' => VALID_NOT_EMPTY,

    'birthday' => VALID_NOT_EMPTY,

    'location' => VALID_NOT_EMPTY,

    'email' => VALID_EMAIL

  );

and having error: undefined constant VALID_NOT_EMPTY

how can I change for CAKE 1.3 ???

thanks 

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