Assertion failed <dst.data != src.data > in unknown function ../../ocv/opencv/modules/imgproc/src/imgwarp.cpp

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Hey please can someone help me to found the solution of this error :

Assertion failed in unknown function ../../ocv/opencv/modules/imgproc/src/imgwarp.cpp

i try to compile the WARPING code that exist in this link :

http://ipwithopencv.googlecode.com/svn/trunk/ThinPlateSpline/ThinPlateSpline/

im using 2 classes and the main:

here is my main code :

#include "stdafx.h"
#include <cv.h>
#include <cxcore.h>
#include <highgui.h>
#include "CThinPlateSpline.h"
#include "iostream"

using namespace std; 

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

    // load a nice picture

    cv::Mat img = cv::imread("lena.jpg");

    // generate some generic points
    // usually you would use a interest point detector such as SURF or SIFT
    std::vector<cv::Point> iP, iiP;

    // push some points into the vector for the source image
    iP.push_back(cv::Point(50,50));
    iP.push_back(cv::Point(400,50));
    iP.push_back(cv::Point(50,400));
    iP.push_back(cv::Point(400,400));
    iP.push_back(cv::Point(256,256));
    iP.push_back(cv::Point(150,256));

    // push some point into the vector for the dst image
    iiP.push_back(cv::Point(70,70));
    iiP.push_back(cv::Point(430,60));
    iiP.push_back(cv::Point(60,410));
    iiP.push_back(cv::Point(430,420));
    iiP.push_back(cv::Point(220,280));
    iiP.push_back(cv::Point(180,240));

    // create thin plate spline object and put the vectors into the constructor
    CThinPlateSpline tps(iP,iiP);


    // warp the image to dst
    Mat dst;
    tps.warpImage(img,dst,0.01,INTER_CUBIC,BACK_WARP);


    // show images
    cv::imshow("original",img);
    cv::imshow("distorted",dst);
    //cv::waitKey(0);
    //Sleep(5);
    cv::waitKey(5000); 
    return 0;
}

here is the is the imagewarp method :

void CThinPlateSpline::warpImage(const Mat& src, Mat& dst, float lambda, const int interpolation,const TPS_INTERPOLATION tpsInter)
{
    Size size = src.size();
    dst = Mat(size,src.type());

    // only compute the coefficients new if they weren't already computed
    // or there had been changes to the points
    if(tpsInter == BACK_WARP && !FLAG_COEFFS_BACK_WARP_SET)
    {
        computeSplineCoeffs(pSrc,pDst,lambda,tpsInter);
    }
    else if(tpsInter == FORWARD_WARP && !FLAG_COEFFS_FORWARD_WARP_SET)
    {
        computeSplineCoeffs(pSrc,pDst,lambda,tpsInter);
    }

    computeMaps(size,mapx,mapy);

    remap(src,dst,mapx,mapy,interpolation);
}

there is to other classes that exist in the link CthinPlateSpline.cpp and CthinPlateSpline.h http://ipwithopencv.googlecode.com/svn/trunk/ThinPlateSpline/ThinPlateSpline/...please i really need help and sorry for my bad english