Composansts perso accès à une table via xpdo impossible

<?php
$modx=&$modx;
$modx->addPackage('tecknocracy',$modx->getOption('core_path').'components/','tck_');

$sanitizedRequests = $modx->sanitize($_GET); // recommended, will be applied to all $_GET, $_POST, $_COOKIE
$_GET = array();
$_GET = $sanitizedRequests;

$c = $modx->getObject('tckCountry', array('id' => '1'));

return $modx->toJSON($c);

?>

[2012-02-10 17:32:02] (ERROR @ /index.php) Could not load class: tckCountry from mysql.tckcountry.
[2012-02-10 17:32:02] (ERROR @ /index.php) tckCountry::load() is not a valid static method.

<?xml version="1.0" encoding="utf-8"?>
<model package="Tecknocracy" baseClass="xPDOObject" platform="mysql" defaultEngine="MyISAM" tablePrefix="tck_">

<object class="tckCountry" table="country" extends="xPDOSimpleObject">
	<field key="id" dbtype="int" precision="11" phptype="integer" null="false" default="" index="index" generated="native"/>
	<field key="class_key" dbtype="varchar" precision="100" phptype="string" null="false" default="tckCountry" />
	<field key="name" dbtype="varchar" precision="255" phptype="string" null="false" />
	<field key="iso" dbtype="varchar" precision="5" phptype="string" null="false" />
</object>

</model>