Client Communication Server via SNMP protocol

Question

I am trying to create a communication between client and server via SNMP protocol, and to begin, I installed Visual Studio 2017 and downloaded, via Nuget, the Lextm.SharpSnmpLib. I searched the Internet for an example of code so I could find a base. Until I reach this code:

using Lextm.SharpSnmpLib;
using Lextm.SharpSnmpLib.Messaging;
using System;
using System.Collections.Generic;
using System.Net;

using System.Windows.Forms;



namespace SNMPGetStart
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void label1_Click(object sender, EventArgs e)
        {

        }
        private void btnAtualizar_Click(object sender, EventArgs e)
        {
            var result = Messenger.Get(VersionCode.V2,
                           new IPEndPoint(IPAddress.Parse("127.0.0.1"), 161),
                           new Lextm.SharpSnmpLib.OctetString("public"),
                           new List<Variable> { new Variable(new ObjectIdentifier("1.3.6.1.2.1.1.5")) },
                           60000);
            txtIP.Text = result.ToString();
        }
    }
}

is firing an exception in the file SharpSnmpLib.dll

Exceção gerada: 'Lextm.SharpSnmpLib.Messaging.ErrorException' em SharpSnmpLib.dll
Ocorreu uma exceção sem tratamento do tipo "Lextm.SharpSnmpLib.Messaging.ErrorException" em SharpSnmpLib.dll
error in response

What could it be? How can I find such a widespread error?