Datamanager error

[stopy]

Hi,
I'm developing a class to save users directly from my system bypassing vbulletin.

I have a problem.
Saving data I get database tipical vbulletin error but, datas are correct saved!

My code follow, is someone able to tell me why appens this?
(informations are for test)

Thanks

<?php
require_once('./global.php');
$dm =& datamanager_init('User', $vbulletin, ERRTYPE_ARRAY); 

$dm->set('username','utentedadm8');
$dm->set('usergroupid',2);
$dm->set('password','123456');
$dm->set('email','[email protected]');
$dm->set('usertitle','Matricola');
$dm->set('timezoneoffset',2);
$dm->set('birthday','10-06-1984');
$dm->set('birthday_search','1984-06-10');
$dm->set('pmpopup',1);
$dm->set('ipaddress',$_SERVER['REMOTE_ADDR']);
$dm->set('autosubscribe',2);
$dm->set('startofweek',2);



$dm->pre_save();
if (count($dm->errors) > 0)
{
    // Errors occurred. Do not proceed with the save.
    // You may want to loop through $dataman->errors and 
    // display the results the user.
    echo "ERRORS <pre>";
    print_r($dm->errors);
    echo "</pre>";
   
}
else
{
    // No errors occurred.
    // Proceed with the save (see the next step).
    // inserting a new user
        $userid = $dm->save();
        echo $userid;
        // updating an existing record
        @$dm->save();
        
        
}  

?>

[stopy]

Sorry I'm an'idiot!
I called save() twice!!!