Route notFound when Using Any Parameters

Hi to all

I'm facing problems with route on phalcon

Here is my route:

$router->add('/carregador/carregar-por-quantidade/:param',
                 ['controller' => 'Carregador',
                  'action' => 'carregarPorQuantidade',
                  'param' => 1]);

Here is my notFound route:

 $router->notFound(
     [
         'controller' => 'Carregador',
         'action'     => 'route404',
     ]
 );

Here is my carregarPorQuantidadeAction on CarregadorController:

     public function carregarPorQuantidadeAction($quant) {
         var_dump($this->dispatcher->getParam("param"));
         var_dump($this->dispatcher->getParams());
         var_dump('oi teste');
         var_dump($quant);die;
    }

Here my route404Action:

 public function route404Action() {
         var_dump('naõ encontrou a merda');
         var_dump($this->dispatcher->getParams());
     }

The problem is clear for me. When I try to use some parameter , it don't find the route to carregarPorQuantidade and goes to route404. If I dont use any parameters on carregarPorQuantidade, it finds the route perfectly. So, I'm new here and I need some help.

Thank you in advance.