Use this. Controller. Logon (the UserInfo. DefaultUser); There is an error

[FengTingLe]

My code：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using ABB.Robotics;
using ABB.Robotics.Controllers;
using ABB.Robotics.Controllers.Discovery;
using ABB.Robotics.Controllers.RapidDomain;
using ABB.Robotics.Controllers.MotionDomain;

namespace _3
{

public partial class Form1 : Form
{
private NetworkScanner scanner = null;
private Controller controller = null;
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{

this.scanner = new NetworkScanner();
this.scanner.Scan();
ControllerInfo controllers = scanner.GetControllers();
ControllerInfo aControllerInfo = controllers[0];
if (aControllerInfo.Availability == Availability.Available)
{
if (this.controller != null)
{
this.controller.Logoff();
this.controller.Dispose();
this.controller = null;
}
this.controller = ControllerFactory.CreateFrom(aControllerInfo);
this.controller.Logon(UserInfo.DefaultUser);
}
else
{
MessageBox.Show(“控制器不可用”);
}
}
}

[John_Verheij]

I tried to run your code and in my case it works without any problems. Did you import the correct references? And as check you have to open RobotStudio with a system.