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cv::seamlessClone is getting error (matrix.cpp:2236: error: (-215) CV_MAT_TYPE(mtype) == m.type() in function create) in ios

 UIImageToMat([UIImage imageNamed:@"lisa_opencv_poisson.png"], src);
 UIImageToMat([UIImage imageNamed:@"mona_opencv_poisson.png"], tar);
 UIImageToMat([UIImage imageNamed:@"vinci_mask.png"], msk);

cv::Mat out1;
cv::seamlessClone(src, tar, msk, cv::Point(tar.cols/2,tar.rows/2), out1, cv::NORMAL_CLONE); // crash in this line
UIImageWriteToSavedPhotosAlbum(MatToUIImage(out1), nil, nil, nil);

NB: src and msk have same size