cannot print "Hello World" in EPSON printer

Hi im trying to simply print "Hello World" but I get an error "The value of the 'DevicePath' property must be defined by the service object before Open() can be called." and it points to this line printer.Open();

I am using .NET 4.8 and I have referenced the Microsoft.PointOfService; already. TIA.

using Microsoft.PointOfService;
using System;

namespace PrinterTest
{
    class Program
    {
        static void Main(string[] args)
        {
            PosExplorer explorer = new PosExplorer();
            DeviceCollection devices = explorer.GetDevices(DeviceType.PosPrinter);

            Console.WriteLine("Checking for connected POS Printers...");
            foreach (DeviceInfo device in devices)
            {
                if (device.ServiceObjectName.IndexOf("TM-U220B", StringComparison.OrdinalIgnoreCase) >= 0)
                {
                    Console.WriteLine("TM-U220B printer is connected!");

                    PosPrinter printer = (PosPrinter)explorer.CreateInstance(device);

                    printer.Open();

                    printer.Claim(1000);

                    printer.DeviceEnabled = true;

                    printer.PrintNormal(PrinterStation.Receipt, "Hello World\n");

                    //printer.Cut(PosPrinterCutType.FullCut);

                    printer.Release();
                    printer.Close();

                    Console.WriteLine("Printed 'Hello World' successfully.");
                    break;
                }
            }

            Console.WriteLine("Press any key to exit...");
            Console.ReadKey();
        }
    }
}