A USB HID Component for C#

Marshal.SizeOf(myPSP_DEVICE_INTERFACE_DETAIL_DATA)

UsbLibrary.HIDDeviceException: Msg:UsbLibrary.HIDDeviceException: Msg:Failed to create device file WinEr:00000005
   in UsbLibrary.HIDDevice.Initialise(String strPath) in C:\Users\asy\Documents\Visual Studio 2008\Projects\usb_hid\usb hid\UsbLibrary\HIDDevice.cs:string 126
   in UsbLibrary.HIDDevice.FindDevice(Int32 nVid, Int32 nPid, Type oType) in C:\Users\asy\Documents\Visual Studio 2008\Projects\usb_hid\usb hid\UsbLibrary\HIDDevice.cs:string 257
   in UsbLibrary.HIDDevice.FindDevice(Int32 nVid, Int32 nPid, Type oType) in C:\Users\asy\Documents\Visual Studio 2008\Projects\usb_hid\usb hid\UsbLibrary\HIDDevice.cs:string 265
   in UsbLibrary.SpecifiedDevice.FindSpecifiedDevice(Int32 vendor_id, Int32 product_id) in C:\Users\asy\Documents\Visual Studio 2008\Projects\usb_hid\usb hid\UsbLibrary\SpecifiedDevice.cs:string 42
   in UsbLibrary.UsbHidPort.CheckDevicePresent() in C:\Users\asy\Documents\Visual Studio 2008\Projects\usb_hid\usb hid\UsbLibrary\UsbHidPort.cs:строка 218

        /// <summary>
        /// Initialises the device
        /// </summary>
        /// <param name="strPath">Path to the device</param>
        private void Initialise(string strPath)
        {
            // Create the file from the device path;
            m_hHandle = CreateFile(strPath, GENERIC_READ | GENERIC_WRITE, 0, IntPtr.Zero, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, IntPtr.Zero);
 
            if (m_hHandle == InvalidHandleValue)
            {
                // some devices require sharing to be enabled
                m_hHandle = CreateFile(strPath, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ|FILE_SHARE_WRITE, IntPtr.Zero, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, IntPtr.Zero);
            }

protected override void OnHandleCreated(EventArgs e)
{
base.OnHandleCreated(e);
usb.RegisterHandle(Handle);
}
protected override void WndProc(ref Messagea m)
{
usb.ParseMessages(ref m); (Here i m getting Error "Object reference not set to an object.")
base.WndProc(ref m); // pass message on to base form
}

try
            {
                m_oFile.Write(oOutRep.Buffer, 0, oOutRep.BufferLength);
            }
            catch (IOException ex)
            {
                //Console.WriteLine(ex.ToString());
                // The device was removed!
                throw new HIDDeviceException("Probbaly the device was removed");
            }
            catch(Exception exx)
            {
                Console.WriteLine(exx.ToString());
            }

IOException