Mesaj #3098678 - ZShadow - Bu kodlarda ne hata var

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

using System.Net;

using HtmlAgilityPack;



namespace WindowsFormsApp12

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }



        private void button1_Click(object sender, EventArgs e)

        {



            Uri url = new Uri("https://www.dunya.com/");

            WebClient client = new WebClient();

            string htmlstring = client.DownloadString(url);



            HtmlAgilityPack.HtmlDocument htmlbelge = new HtmlAgilityPack.HtmlDocument();



            htmlbelge.OptionFixNestedTags = true;

            htmlbelge.LoadHtml(htmlstring);

            

            listBox1.Items.Add(htmlbelge.DocumentNode.SelectSingleNode("//*[@id='wrap']/div[2]/section/div/div[1]/h1").InnerText);

            











        }

    }

}

Şu hatayı alıyorum

System.NullReferenceException: 'Nesne başvurusu bir nesnenin örneğine ayarlanmadı.'



HtmlAgilityPack.HtmlNode.SelectSingleNode(...) returned null.

Html agility packi yeni öğreniyorum yardım ederseniz sevinirim.

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