proszę o poprawienie kodu. błąd z Emgu.CV.CvInvoke

wyskakuje mi błąd "Inicjator typów zgłosił wyjątek dla typu 'Emgu.CV.CvInvoke'."

 
using Emgu.CV;
using Emgu.CV.CvEnum;
using Emgu.CV.Structure;
using Emgu.CV.UI;
namespace WindowsFormsApplication
{   /////////////////////////////////////
    public partial class Form1 : Form
    {
        /////////////////////////////////////

        Capture capWebcam = null;
        bool blnCapturingInProcess = false;
        Image<Bgr, Byte> imgOriginal;
        Image<Gray, Byte> imgProcessed;

        /////////////////////////////////////
        public Form1()
        {
            InitializeComponent();
        }
        /////////////////////////////////////
        private void Form1_Load(object sender, EventArgs e)
        {
            try
            {
                capWebcam = new Capture(); //TU BŁĄD
            }
            catch (NullReferenceException except)
            {
                txtXYRadlus.Text = except.Message;
                return;
            }
            Application.Idle += processFrameAndUpdateGUI;
            blnCapturingInProcess = true;
        }
        /////////////////////////////////////
        private void Form1_FormClosed(object sender, FormClosedEventArgs e)
        {
            if (capWebcam != null)
            {
                capWebcam.Dispose();
            }
        }
        /////////////////////////////////////
        void processFrameAndUpdateGUI(object sender, EventArgs arg)
        {
            imgOriginal = capWebcam.QueryFrame();
            if (imgOriginal == null) return;
            imgProcessed = imgOriginal.InRange(new Bgr(0, 0, 175),
                                               new Bgr(100, 100, 256));
            imgProcessed = imgProcessed.SmoothGaussian(9);
            CircleF[] circles = imgProcessed.HoughCircles(new Gray(100),
                                                         new Gray(50),
                                                         2,
                                                         imgProcessed.Height / 4,
                                                         10,
                                                         400)[0];
            foreach (CircleF circle in circles)
            {
                if (txtXYRadlus.Text != "") txtXYRadlus.AppendText(Environment.NewLine);
                txtXYRadlus.AppendText("ball position = x" + circle.Center.X.ToString().PadLeft(4) +
                ", y = " + circle.Center.Y.ToString().PadLeft(4) +
                ", radius =" + circle.Radius.ToString("###.000").PadLeft(7));
                txtXYRadlus.ScrollToCaret();

                CvInvoke.cvCircle(imgOriginal,
                                  new Point((int)circle.Center.X, (int)circle.Center.Y),
                                  3,
                                  new MCvScalar(0, 255, 0),
                                  -1,
                                  LINE_TYPE.CV_AA,
                                  0);

                imgOriginal.Draw(circle,
                                 new Bgr(Color.Red),
                                 3);
            }
            ibOriginal.Image = imgOriginal;
            ibProcessed.Image = imgProcessed;

        }
        /////////////////////////////////////
        private void btnPauseOrResume_Click(object sender, EventArgs e)
        {
            if (blnCapturingInProcess == true)
            {
                Application.Idle -= processFrameAndUpdateGUI;
                blnCapturingInProcess = false;
                btnPauseOrResume.Text = "resume";
            }
            else
            {
                Application.Idle += processFrameAndUpdateGUI;
                blnCapturingInProcess = true;
                btnPauseOrResume.Text = "pause";
            }
        }
        /////////////////////////////////////
    }
}