CodeIgniter 2 and Doctrine 2

[eluser]jonsaw[/eluser]
tselaty's tutorial was a great help!

I have a quick question though - how come the regular DQL queries don't work. Am I missing a step?

Example:

$dql = "SELECT model FROM product p WHERE p.id = ?1";

$products = $this->em->createQuery($dql)
->setMaxResults(15)
->setParameter(1, 1)
->getResult();

foreach ($products AS $product) {
echo $product->getModel() . "\n";
}

I keep getting this error: "APPPATH/libraries/Doctrine/ORM/Mapping/MappingException.ph"