What is causing the expected literal error?

I have a query that has a syntax error. This is the error!

string(63) “[Syntax Error] line 0, col 57: Error: Expected Literal, got ‘d'”

public function getDomain(string $country)
{
    try {
        return $this->createQueryBuilder('d')
            ->where(':country NOT IN (d.blocked_countries)')
            ->setParameter('country', $country)
            ->setMaxResults(1)
            ->getQuery()
            ->getSingleResult()
            ;
    } catch (Exception $exception) {
        return $exception->getMessage();
    }
}

Answer

Thanks, i made it like that because -> setParameter is safer

    {
        try {
            return  $this->createQueryBuilder('d')
                ->where('d.blocked_countries NOT LIKE :code')
                ->setParameter('code', "%$code%")
                ->setMaxResults(1)
                ->getQuery()
                ->getOneOrNullResult()
            ;
        } catch (Exception $exception) {
            return null;
        }
    }