C#: The type initializer for 'Emgu.CV.CvInvoke' threw an exception

sorry for late reply bro,
i send code below in visual studio 2010 with c#, i use metro framework.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using MetroFramework.Forms;
using System.Data.Odbc;
using System.Data.SqlClient;
using System.Configuration;
using System.Media;
using System.Drawing.Imaging;
using Emgu.CV;
using Emgu.CV.UI;
using Emgu.CV.Structure;
using Emgu.Util;
using System.Runtime.InteropServices;

namespace Visitor_GatePass_Management_System
{
// public partial class VisitorMasterPage : Form

public partial class VisitorMasterPage : MetroForm
{

public VisitorMasterPage()
{
InitializeComponent();
}

private Emgu.CV.Capture _capture;
//private static Emgu.CV.Capture _capture;
private bool _captureInProgress;
//Emgu.CV.Capture _capture;
//bool _captureInProgress;

private void VisitorMasterPage_Load(object sender, EventArgs e)
{
lblpath.Text = "D:\\image.jpg";


}

private void btncapphonto_Click(object sender, EventArgs e)
{
if ((this.lblpath.Text.Trim().Length > 0))
{
if ((_capture==null))

{
try
{
//_capture = new Emgu.CV.Capture();

_capture = new Capture();
}
catch (NullReferenceException excpt)
{
MetroFramework.MetroMessageBox.Show(this, excpt.Message);
}
}
if (((_capture != null)))
{
if (_captureInProgress)
{
this.btncapphonto.Text = "Start Capture";
// this.Load +=new EventHandler(this.ProcessFrame);
//EventHandlerList list=(EventHandlerList)
Application.Idle -= new EventHandler(this.ProcessFrame);

this.pbphoto.Image.Save(this.lblpath.Text, ImageFormat.Jpeg);
this.pbphoto.ImageLocation = this.lblpath.Text;
}
else
{
// captureButton.Text = "Capture"
this.btncapphonto.Text = "Capture";
Application.Idle += new EventHandler(this.ProcessFrame);
}
_captureInProgress = !_captureInProgress;
}
}
else
{
MetroFramework.MetroMessageBox.Show(this, "Please set directory path for saving the image.");
}
}

private void ProcessFrame(object sender, EventArgs arg)
{
//Emgu.CV.Image[] frame(Emgu.CV.Structure.Bgr,Byte)= this._capture.QueryFrame;
Emgu.CV.Image<emgu.cv.structure.bgr, byte=""> frame = this._capture.QueryFrame();
Emgu.CV.Image<emgu.cv.structure.bgr, byte=""> frame1 = frame.Resize(150, 150, Emgu.CV.CvEnum.INTER.CV_INTER_LINEAR);
pbphoto.Image = frame1.Bitmap;
}

private void btnSaveVisitorMaster_Click(object sender, EventArgs e)
{

}

}
}