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getting openCv error- Image step is wrong in EigenFaces.Predict() method

I am getting error in EigenFaces.predict() method in java cv face recognition. The error is-

OpenCV Error: Image step is wrong (The matrix is not continuous, thus its number of rows can not be changed) in unknown function, file ......\src\opencv\modules\core\src\matrix.cpp, line 802

my code is-

public static void main(String[] args)  {
long size=6;
MatVector imgs=new MatVector(size);
int[] id={0,0,0,0,0,0};

FaceRecognizer fr=opencv_contrib.createEigenFaceRecognizer();
for(int i=0;i<=5;i++)
    String url="C:/Users/vivek/Documents/NetBeansProjects/Recognizer2/src/a"+(i+1)+".jpg";
    IplImage img=opencv_highgui.cvLoadImage(url);

IplImage testImage=opencv_highgui.cvLoadImage("C:/Users/vivek/Documents/NetBeansProjects/Recognizer2/src/a3.jpg");
CvMat mat= testImage.asCvMat();
int val=fr.predict(mat);