custom fields and php

Hello

I'm trying to get the value of a custom field "custitem13" using the internal ID of the item in PHP but i cant.

I'm making some tests with a code provided by benjsicam in the past (show below) and works fine but i'm getting this error at the end and i cant see the custom fields



Custom Column Fields

Fatal error: Call to a member function getCustomFieldValue() on a non-object in C:\xampp\htdocs\rana\test.php on line 61



Thanks a lot





<?php    

require_once '../PHPtoolkit.php';
require_once 'login_info.php';

global $myNSclient;
global $myDirectory;

$myNSclient->setSearchPreferences(false, 50);