[Mono-list] LibUsbDotNet Unhandled Exception

[Napcaia]

Hi, I'm New with mono and C#, and I want to stablish the communication
between ubuntu an the pic (18f2550) via Usb  using LibUsbDotNet. but when I
use the example code in the documentation I have the following message:


"
Finding your device..

Unhandled Exception: System.ArgumentException: An empty file name is not
valid.
  at System.IO.FileSystemInfo.CheckPath (System.String path) [0x00000] 
  at System.IO.DirectoryInfo..ctor (System.String path, Boolean
simpleOriginalPath) [0x00000] 
  at System.IO.DirectoryInfo..ctor (System.String path) [0x00000] 
  at (wrapper remoting-invoke-with-check) System.IO.DirectoryInfo:.ctor
(string)
  at LibUsbDotNet.UsbGlobals.get_HasWinUsbDriver () [0x00000] 
  at LibUsbDotNet.UsbGlobals.get_AllDevices () [0x00000] 
  at Examples.GettingStarted.Main (System.String[] args) [0x0000a] in
/home/eder/Projects/Prueba/Prueba/Main.cs:23 
"

This is the sample code from the LibUsbDotNet webpage:

using System;
using Gtk;
using LibUsbDotNet;
using LibUsbDotNet.Info;
using LibUsbDotNet.Main;

namespace Examples
{
    internal class GettingStarted
    {
        public static UsbDevice MyUsbDevice;

        #region SET YOUR USB Vendor and Product ID!

        public static UsbDeviceFinder MyUsbFinder = new
UsbDeviceFinder(0x04d8,0x0011);

        #endregion

        public static void Main(string[] args)
        {
            // Check for a valid & connected usb device by vendor and
product id.
            Console.WriteLine("Finding your device..");
            UsbRegistry myUsbRegistry =
UsbGlobals.AllDevices.Find(MyUsbFinder);

            if (ReferenceEquals(myUsbRegistry, null))
            {
                // The device is not connected or cannot be accessed by
libusbdotnet
                Console.WriteLine("Device not connected!");
                ShowLastUsbError();
                return;
            }

            // Display the usb device description from the registry.
            // This is the description that was set by the install inf. 
            Console.WriteLine("Found device {0}",
myUsbRegistry[SPDRP.DeviceDesc]);

            // Display the usb devices DeviceInterfaceGuids.
            // This set by the install inf.

            Guid[] deviceInterfaceGuids =
myUsbRegistry.DeviceInterfaceGuids;
            foreach (Guid deviceInterfaceGuid in deviceInterfaceGuids)
                Console.WriteLine("Device Interface Guid: {0}",
deviceInterfaceGuid);

            // Open this usb device.
            if (!myUsbRegistry.Open(out MyUsbDevice))
            {
                // If a UsbRegistry class is obtained this should never
happen with libusb-win32.
                // It will happen with WinUsb only of the device is being
used by another process.
                Console.WriteLine("Failed opening device!");
                ShowLastUsbError();
                return;
            }

            // Get the REAL usb DeviceDescriptor information from the usb
device.
            // Up until this point, we have just been querying the windows
registry,
            // nothing had actually been sent or received from the usb
device.
            UsbDeviceInfo myDeviceInfo = MyUsbDevice.Info;

            // Dump the UsbDeviceDesciptor to console output.
            Console.WriteLine(myDeviceInfo.Descriptor.ToString());

            // Display REAL Manufacturer String (if one exists)
            if (myDeviceInfo.Descriptor.ManufacturerStringIndex != 0)
                Console.WriteLine("Manufacturer: {0}",
myDeviceInfo.ManufacturerString);

            // Display REAL Product String (if one exists)
            if (myDeviceInfo.Descriptor.ProductStringIndex != 0)
                Console.WriteLine("Product: {0}",
myDeviceInfo.ProductString);

            // Display REAL Serial Number String (if one exists)
            if (myDeviceInfo.Descriptor.SerialStringIndex != 0)
                Console.WriteLine("Serial Number: {0}",
myDeviceInfo.SerialString);

            // Close the device.
            // When a UsbDevice class is closed, it is disposed and all
resources 
            // are freed. It cannot be re-open; you must create a new
instance.
            MyUsbDevice.Close();

            // Wait for user input..
            Console.ReadKey();
        }

        private static void ShowLastUsbError()
        {
            Console.WriteLine("Error Number: {0}",
UsbGlobals.LastErrorNumber);
            Console.WriteLine(UsbGlobals.LastErrorString);

            // Wait for user input..
            Console.ReadKey();
        }
    }
}

I hope you can help me

Thanks.
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