Emgu.CV.Util.CvException: OpenCV: index is out of range

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Emgu.CV.Util.CvException: OpenCV: index is out of range
   在 System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous)
   在 System.Windows.Forms.Control.Invoke(Delegate method, Object[] args)
   在 System.Windows.Forms.Control.Invoke(Delegate method)
   在 Emgu.CV.UI.ImageBox.set_Image(IImage value)
   在 Mainindex.mainImageProcess.ProcessImage(Object sender, EventArgs e) 位置 e:\renzhengheyi\Recognition\Mainindex\mainImageProcess.cs:行号 136
   在 Emgu.CV.VideoCapture.Grab()
   在 Emgu.CV.VideoCapture.Run(ExceptionHandler eh)}