cPanel UAPI returns null

Hi, I created a little script for manage email accounts from my reseller hosting... This script use the cPanel UAPI Library created by N1ghteyes (github.com/N1ghteyes/cpanel-UAPI-php-class) and works very well... Recently a friend tried to use it in his VPS (from Mochahost), but It doesn't work... So we created a simple file for try the connection (below is the code) [PHP]uapi->Resellers->list_accounts(); var_dump($list_main_domains['data'>); ?>[/PHP] But always it return this: D:\xampp\WHMEmailManager\api_test.php:10:null Why happend this? (We are trying using the "root" account) And this is my script (in Spanish): github.com/KuroiNekoWitch/WHMEmailManager