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