unable to update back4app database in android studio

Question

So I've linked my android app to back4app parse server. According to their documentation when I run the following code a class is supposed to be created in the database. However Android studio shows the following errors:

1. cannot resolve symbol SaveCallback
2. Method does not override method from its superclass

package com.example.android.beastt;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

import com.parse.ParseObject;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.widget.Toast;

import com.parse.Parse;
import com.parse.ParseException;
import com.parse.ParseUser;

import java.util.Arrays;


public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ParseObject soccerPlayers = new ParseObject("SoccerPlayers");
// Store an object
        soccerPlayers.put("playerName", "A. Wed");
        soccerPlayers.put("yearOfBirth", 1997);
        soccerPlayers.put("emailContact", "a.wed@email.io");
        soccerPlayers.addAllUnique("attributes", Arrays.asList("fast", "good conditioning"));
// Saving object
        soccerPlayers.saveInBackground(new SaveCallback() {
            @Override
            public void done(ParseException e) {
                if (e == null) {
                    // Success
                } else {
                    // Error
                }
            }
        });
    }
}