help with visualizing data in app

I have a problem, it's about saving data and then reading them through the firestone, at the time of saving it does it well, but when I want to see what the app saves, it closes, I do not know much about the app.

package com.example.luis.myapplication;

import java.io.Serializable;

public class Product implements Serializable {

    private String name, brand, description;
    private double price;
    private int qty;

    public Product(String name, String brand, String description, double price, int qty) {
        this.name = name;
        this.brand = brand;
        this.description = description;
        this.price = price;
        this.qty = qty;
    }

    public String getName() {
        return name;
    }
    public String getBrand() {
        return brand;
    }
    public String getDescription() {
        return description;
    }
    public double getPrice() {
        return price;
    }
    public int getQty() {
        return qty;
    }
}

in the logcat among so many codes I get this ...

java.lang.RuntimeException: Could not deserialize object. Class com.example.luis.myapplication.Product does not define a no-argument constructor. If you are using ProGuard, make sure these constructors are not stripped  

  at com.google.firebase.firestore.util.CustomClassMapper.deserializeError(com.google.firebase:firebase-firestore@@17.1.2:524)
        at com.google.firebase.firestore.util.CustomClassMapper.access$100(com.google.firebase:firebase-firestore@@17.1.2:53)
        at com.google.firebase.firestore.util.CustomClassMapper$BeanMapper.deserialize(com.google.firebase:firebase-firestore@@17.1.2:680)
        at com.google.firebase.firestore.util.CustomClassMapper$BeanMapper.deserialize(com.google.firebase:firebase-firestore@@17.1.2:674)
        at com.google.firebase.firestore.util.CustomClassMapper.convertBean(com.google.firebase:firebase-firestore@@17.1.2:503)
        at com.google.firebase.firestore.util.CustomClassMapper.deserializeToClass(com.google.firebase:firebase-firestore@@17.1.2:242)
        at com.google.firebase.firestore.util.CustomClassMapper.convertToCustomClass(com.google.firebase:firebase-firestore@@17.1.2:97)
        at com.google.firebase.firestore.DocumentSnapshot.toObject(com.google.firebase:firebase-firestore@@17.1.2:203)
        at com.google.firebase.firestore.QueryDocumentSnapshot.toObject(com.google.firebase:firebase-firestore@@17.1.2:121)
        at com.google.firebase.firestore.DocumentSnapshot.toObject(com.google.firebase:firebase-firestore@@17.1.2:183)
        at com.google.firebase.firestore.QueryDocumentSnapshot.toObject(com.google.firebase:firebase-firestore@@17.1.2:101)
        at com.example.luis.myapplication.ProductsActivity$1.onSuccess(ProductsActivity.java:55)
        at com.example.luis.myapplication.ProductsActivity$1.onSuccess(ProductsActivity.java:43)
        at com.google.android.gms.tasks.zzn.run(Unknown Source)
        at android.os.Handler.handleCallback(Handler.java:761)
        at android.os.Handler.dispatchMessage(Handler.java:98)
        at android.os.Looper.loop(Looper.java:156)
        at android.app.ActivityThread.main(ActivityThread.java:6523)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:942)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:832)

among so many codes I get this ...