请问为什么在方法中使用访问修饰符会报错？

using UnityEngine;

public class Graph : MonoBehaviour
{
    public Transform pointPrefab;
    public int resolution = 10;

    private void Awake()
    {
        private int a ;//这句原文为字段
        Vector3 scale = Vector3.one / 5f;
        Vector3 position;
        //position.y = 0f;
        position.z = 0f;
        for (int i = 0; i < 10; i++)
        {
            Transform point = Instantiate(pointPrefab);
            //point.localPosition = Vector3.right * ((i + 0.5f) /5f -1f);
            position.x = (i + 0.5f) / 5f - 1f;
            position.y = position.x * position.x;
            point.localPosition = position;

            point.localScale = scale;
        }
    }

}