Parse function?

$base_path = MODX_CORE_PATH . 'components/mycmp/';
$modx->addPackage('mycmp',$base_path.'model/','');  

$things = $modx->getCollection('Things',array());

$output = '';

$x = new modElement();
$tpl = '
<tr>
<td>[[+thing_id]]</td>
<td>[[+name]]</td>
<td>[[+etc]]</td>
</tr>
';
foreach ($things as $t)
{
	$output = $x->process( $t->toArray(), $tpl);
}

return $output;

Fatal error: Call to a member function getPackage() on a non-object in /path/to/revo/core/xpdo/om/xpdoobject.class.php on line 598

$x = $modx->newObject('modChunk');
$tpl = '
<tr>
<td>[[+thing_id]]</td>
<td>[[+name]]</td>
</tr>
';
foreach ($things as $t)
{
	$x->setCacheable(false);
	$output .= $x->process( $t->toArray(), $tpl);
}
return $output;

$tpl = '
<tr>
<td>[[+thing_id]]</td>
<td>[[+name]]</td>
</tr>
';
foreach ($things as $t){
    $x = $modx->newObject('modChunk');
    $x->setCacheable(false);
    $x->setContent($tpl);
    $output .= $x->process( $t->toArray());
}
return $output;

		foreach ($thing as $t)
		{
			$x = $modx->newObject('modChunk');
			$x->setCacheable(false);
			$x->setContent($tpl);
			$output .= $x->process( $t->toArray() );
		}

foreach ($thing as $t)
{
   $x = $modx->newObject('modChunk');
   $x->setCacheable(false);
   $x->setContent($tpl);
   $output .= $x->process( $t->toArray() );
}

$prefix = preg_quote('[[');
$suffix = preg_quote(']]');
$regex = '/' . $prefix . '\+[^' . $prefix . $suffix . ']+' . $suffix . '/';
if($result = preg_replace($regex ,'',$output))
{
   $output = $result;
}

$regex = '/' . $prefix . '\+[a-zA-Z0-9_]+' . $suffix . '/';