МНОГО ОШИБОК В КОДЕ ПОМОГИТЕ ПЖ UNITY C#

Using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.SceneManagement;

public class AchMenu : MonoBehaviour
{
public int total_money
[SerializeField] Button firstAch;
[SerializeField] bool isFirst;
// Start is called before the first frame update
void Start()
{
total_money = PlayerPrefs.GetInt ("total_money");
isFirst = PlayerPrefs.GetInt("isFirst") == 1 ? true : false;
if (total_money >= 10 && !isFirst)
{
firstAch.interactable = true;
}
else
{
firstAch.interactable = false;
}
}

public void GetFirst()
{
int money = PlayerPrefs.GetInt("money");
money += 10;
isFirst = true;
PlayerPrefs.SetInt("isFirst", isFirst ? 1 : 0);
}


public void ToMenu()
{
ScreneManagment.LoadScene(0);
}


// Update is called once per frame
void Update()
{

}
}