System.BadImageFormatException was thrown.

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C#

private void captureButton_Click(object sender, EventArgs e)
        {
            #region if capture is not created, create it now
            if (_capture == null)
            {
                try
                {
                    _capture = new Capture();
                }
                catch (NullReferenceException excpt)
                {
                    MessageBox.Show(excpt.Message);
                }
            }
            #endregion

            if (_capture != null)
            {
                if (_captureInProgress)
                {  //stop the capture
                    captureButton.Text = "Start Capture";
                    Application.Idle -= ProcessFrame;
                }
                else
                {
                    //start the capture
                    captureButton.Text = "Stop";
                    Application.Idle += ProcessFrame;
                }

                _captureInProgress = !_captureInProgress;
            }
        }

When I click on captureButton_Click,it threw an unhandled exception like below:
An attempt was made to load a program with an incorrect format. (System.BadImageFormatException)A System.BadImageFormatException was thrown. An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B)

Can anyone please help me out? I'm new to it. Thanks.
I'm using VS 2010 with 64 bits, emgu library.