setting primary key values with xPDO

<field key="id" dbtype="int" precision="10" attributes="unsigned" phptype="integer" null="false" default="0" index="pk" />

(DEBUG) No primary key value found for pk definition: id

$myUser = $xpdo->newObject('myUser');
$myUser->fromArray($fields, '', true);

INSERT INTO `pfp`.`_landlord` (`title`, `first_name`, `last_name`, `email`, `addr1`, `addr2`, `addr3`, `city`, `county`, `country`, `post_code`, `home_phone`, `work_phone`, `mobile`, `fax`, `web_user_id`, `on_mailing_list`) VALUES('title', 'first_name', 'last_name', 'email', 'addr1', 'addr2', 'addr3', 'city', 'county', 'country', 'post_code', 'home_phone', 'work_phone', 'mobile', 'fax', 10, true) 

INSERT INTO `pfp`.`_landlord`

INSERT INTO `pfp_landlord`

<?php
... // pre-processing above
   // use xpdo to insert the user's data into the landlord table
        include_once ($modx->config['base_path']. 'xpdo/xpdo.class.php');
        $xpdo= new xPDO('mysql:host=localhost;dbname=pfp', "username", "password");
        $xpdo->setPackage('pfp');
$xpdo->setDebug(true);

        // untaint the user's data
        foreach($fields as $fldkey)
        {
            $fields[$fldkey] = $modx->db->escape($modx->stripTags($fields[$fldkey]));
        }

        // create and populate object
        $landlord = $xpdo->newObject('Landlord');
        $landlord->fromArray($fields, '', true);

        // set binary mailing list field
        if ($fields['on_mailing_list'] == 'yes')
            $landlord->set('on_mailing_list', 1);
        else
            $landlord->set('on_mailing_list', 0);

        $landlord->set('web_user_id', $key);            // $key has been set previously
        $landlord->save();
... and finish off...
?>

CREATE TABLE `pfp_landlord` (
  `id` int(10) unsigned NOT NULL auto_increment,
  `title` varchar(20) default NULL,
  `first_name` varchar(200) NOT NULL,
  `last_name` varchar(200) NOT NULL,
  `email` varchar(200) default NULL,
  `addr1` varchar(255) NOT NULL,
  `addr2` varchar(255) default NULL,
  `addr3` varchar(255) default NULL,
  `city` varchar(255) NOT NULL,
  `county` varchar(255) NOT NULL,
  `country` varchar(255) NOT NULL,
  `post_code` varchar(12) NOT NULL,
  `home_phone` varchar(30) default NULL,
  `work_phone` varchar(30) default NULL,
  `mobile` varchar(30) default NULL,
  `fax` varchar(30) default NULL,
  `date_created` timestamp NOT NULL default CURRENT_TIMESTAMP,
  `web_user_id` int(10) unsigned NOT NULL,
  `on_mailing_list` binary(1) default 'F',
  PRIMARY KEY  (`id`),
  UNIQUE KEY `web_user_id` (`web_user_id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COMMENT='Contains details on landlords.' AUTO_INCREMENT=2 ;

$xpdo= new xPDO('mysql:host=localhost;dbname=pfp', "username", "password", "pfp_");