with this code i’m trying to get more details for product table in the data base but i get the error below

  router.get(`/:id`, async (req, res) => {
    const order = await Order.findById(req.params.id)
    .populate('user', 'name')
    .populate({path:'orderItems' , populate: {path: "product", model:"Product"}})
  
    if (!order) {
      res.status(500).json({
        error: err,
        seccess: false,
      });
    } else {
      res.send(order);
    }
  });

i get this error
MissingSchemaError: Schema hasn't been registered for model "Product".

i don’t understand why