RpcLiteralResponseMessageBinder

[troncar]

Im new in symfony and soap, I have a problem with complextype, the service returns this:
spl_object_hash() expects parameter 1 to be object, null given'
ServiceBinding\RpcLiteralResponseMessageBinder.php', '75', array('phpType' => 'AppBundle\Entity\Cancelar', 'message' => null))

class Cancelar{

/**
 * @var float[];
 * @Soap\ComplexType("float[]",nillable=true)
 */
public $limiteDescuento;

 /**
 * @var string[]
 * @Soap\ComplexType("string[]",nillable=true)
 */
public $status;

public function getLimiteDescuento(){
return $this->limiteDescuento;
}

public function setLimiteDescuento($limite_descuento){
$this->limiteDescuento = $limite_descuento;
}

public function getStatus(){
return $this->status;
}

public function setStatus($status){
$this->status = $status;
}

}