fatal error LNK1104: cannot open file 'cv.lib' when using openCV2.1

When I compile this code I get an error: 

[error]

fatal error LNK1104: cannot open file 'cv.lib'

[/error]

In this situtation go to the
project -> *properties -> Configuration Properties -> Linker -> Input -> Additional Dependencies

and add

"cv210d.lib" "cxcore210d.lib" "highgui210d.lib"

for debug option.

and add 

"cv210.lib" "cxcore210.lib" "highgui210.lib"

for release option.

[code]

// OpenCV_Helloworld.cpp : Defines the entry point for the console application.

// Created for build/install tutorial, Microsoft Visual C++ 2010 Express and OpenCV 2.1.0

#include "stdafx.h"

#include <cv.h>

#include <cxcore.h>

#include <highgui.h>

#include <iostream>

using namespace std;

int _tmain(int argc, _TCHAR* argv[])

{

        IplImage *img = cvLoadImage("C:\\work\\kn.jpg",1);

if(img == NULL)

{

cout << "error" << endl;

}

        cvNamedWindow("Image:",CV_WINDOW_AUTOSIZE );

        cvShowImage("Image:",img);

        cvWaitKey();

        cvDestroyWindow("Image:");

        cvReleaseImage(&img);

        return 0;

}

[/code]