Failed to to GPIB address

[KevinSu66]

Hello guys! I am trying to write a C# program to communicate with my Yokogawa multimeter,

I have NI Visa (version 2022 Q3) and Ni488.2 (version 21.5.0)  installed

My Visa resource name for this device is : GPIB0::1::INSTR

here is my C# code,

using System;
using System.Threading;
using System.Windows;
using NationalInstruments.Visa;

namespace GPIB_DMM_voltage
{
class program {

static void Main(string[] args)
{

try
{

var session = (Ivi.Visa.IMessageBasedSession)Ivi.Visa.GlobalResourceManager.Open("GPIB0::01::INSTR");
session.FormattedIO.WriteLine("*IDN?");
string idName = session.FormattedIO.ReadLine();

Console.WriteLine($"*IDN?) = {idName}");
session.Dispose();
session = null;

}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}

Console.WriteLine("press entrer key to end");
Console.ReadLine();

}
}
}

But when I ran it, it is giving me this error.

Anyone know why? please help! and thank you guys!!

[Iwa6]

Maybe the address is wrong.

Wrong : GPIB0::01::INSTR

Correct : GPIB0::1::INSTR

[KevinSu66]

Sorry about that! it was suppose to be 1, I changed it to 01 just to test, but it still didn't work 😞