我如何修复Unity中的超出范围消息

Question

我有这段代码而且我一直收到错误消息

  

参数超出范围

我一直关注这个tutorial并且我一直在关注它。我回去检查了一切，但我仍然收到消息。

这是我的代码：

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

public class DialogSystem : MonoBehaviour {
public static DialogSystem Instance { get; set; }
public GameObject dialogPanel;
public string npcname;
public List<string> dialoglines = new List<string> ();

Button continueButton;
Text dialogText, nameText;
int dialogIndex;


// Use this for initialization
void Awake () {
    continueButton = dialogPanel.transform.Find 
("Continue").GetComponent<Button> ();

    continueButton.onClick.AddListener (delegate {  ContinueDialog(); });
    dialogText = dialogPanel.transform.Find("Text").GetComponent<Text>();
    nameText = 
dialogPanel.transform.Find("Name").GetChild(0).GetComponent<Text>();
    dialogPanel.SetActive(false);



    if (Instance != null && Instance != this) {
        Destroy (gameObject);
    } 
    else 
    {
        Instance = this;
    }
}

public void addNewDialog(string[] lines, string npcname)
{
    dialogIndex = 0;
    dialoglines = new List<string>(lines.Length);
    dialoglines.AddRange (lines);
    this.npcname = npcname;

    Debug.Log (dialoglines.Count);
    CreatDialog ();
}

public void CreatDialog()
{
    dialogText.text = dialoglines [dialogIndex];
    nameText.text = npcname;
    dialogPanel.SetActive (true);
}


public void ContinueDialog()
{
    if (dialogIndex < dialoglines.Count - 1) {
        dialogIndex++;
        dialogText.text = dialoglines [dialogIndex];
    } 
    else 
    {
        dialogPanel.SetActive (false);
    }
}

我不知道，我正在深入工作，而且我是一名新开发人员，我正在努力解决这个问题。任何帮助表示赞赏。