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我遇到了标题错误代码，但不知道我是否遗漏了分号、大括号等。有人知道是什么导致了这个问题吗？

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class FBChatSim : MonoBehaviour{
    // Initialise hashmaps and objects
    //      2 hashmaps takes option as key and response overlay image path as value
    Dictionary<string, string> imgDict=
        new Dictionary<string, string>{
            {"Option1", "chats/answer1.png"},
            {"Option2", "chats/answer2.png"},
            {"Option3", "chats/answer3.png"},
            {"Option4", "chats/answer4.png"}
        };
    Dictionary<string, string> qnsDict=
        new Dictionary<string, string>{ 
            {"Option1", "chats/question1.png"},
            {"Option2", "chats/question2.png"},
            {"Option3", "chats/question3.png"},
            {"Option4", "chats/question4.png"}
        };
    //    2 objects to store the image paths
    public GameObject cube_qns;
    public GameObject cube_reply;
    // Initialise objects
    cube_qns=GameObject.Find("Cube_Qns");
    cube_reply=GameObject.Find("Cube_Reply");
    
    // Declare helper functions
    // ---- LoadPNG() | This function reads png files from the Resources folder as texture
    public static Texture2D LoadPNG(string filePath){
        Texture2D tex = null;
        byte[] fileData;
    
        if (File.Exists(filePath)){
            fileData = File.ReadAllBytes(filePath);
            tex = new Texture2D(2, 2);
            tex.LoadImage(fileData); //..this will auto-resize the texture dimensions.
        }
        return tex;
    }

    // ---- ReplaceMyImages() | This function takes collided object as input and overlays image on it
        // depending on which box is hit, image is assigned depending on imgDict and qnsDict 
        // replace text in chat bubble
        // set chat bubble to visible
    public void ReplaceMyImages(GameObject collidedObject){
        private string obj_name=collidedObject.name;
        cube_reply.GetComponent<Renderer>().material.mainTexture = LoadPNG(imgDict[obj_name]);
        cube_qns.GetComponent<Renderer>().material.mainTexture = LoadPNG(qnsDict[obj_name]);
        cube_qns.SetActive(true);
        cube_reply.SetActive(true);
    }
    
    // Start is called before the first frame update
    void Start(){
        // set the chat bubbles to invisible
        cube_qns.SetActive(false);
        cube_reply.SetActive(false);
    }

    // Update is called once per frame
    void Update(){
        // ray cast and hit box
        ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        // invoke OverlayImage function if cube is hit
        if (Physics.Raycast(ray, out hit) && Input.GetMouseButton(0)){
            Debug.Log( "collide (name) : " + hit.collider.name);
            ReplaceMyImages(hit.collider.gameObject);
        }
    }
}

我试着注解掉代码的某些部分，看看是哪个部分导致了这个问题，但是似乎没有一个部分会影响错误。我还通过逐个折叠括号来检查它们。