用c++编写opencv的程序遇到问题，请各位大佬帮助

金蕊泛流霞

#include <opencv2/opencv.hpp>
#include <iostream>
#include <math.h>

using namespace cv;

int main() {
        Mat src, dst;
        src = imread("C:/Users/Administrator/Desktop/3.jpg");
        if (!src.data) {
                printf("没有图片！");
                return -1;
        }
        namedWindow("input image", CV_WINDOW_AUTOSIZE);
        imshow("input image", src);
        /*
        int cols = (src.cols - 1)*src.channels();
        int offsetx = src.channels();
        int rows = src.rows;
        dst = Mat::zeros(src.size(), src.type());
        for (int row = 1; row < rows; row++) {
                const uchar* previous = src.ptr<uchar>(row - 1);
                const uchar* current = src.ptr<uchar>(row);
                const uchar* next = src.ptr<uchar>(row + 1);
                uchar*output = dst.ptr<uchar>(row);
                for (int col = 1; col < offsetx; col++) {
                        output[col] = saturate_cast<uchar>(5 * current[col] - (current[col - offsetx] + current[col + offsetx] + previous[col] + next[col]));

                }
        }
        */
        Mat kernel = (Mat_<char>(3, 3) << 0, -1, 0, -1, 5, 0, -1, 0);
        filter2D(src, dst, src.depth(), kernel);
        namedWindow("change image output", CV_WINDOW_AUTOSIZE);
        imshow("change image output", dst);
        waitKey(0);
        return 0;
}


错误提示：OpenCV(3.4.2) Error: Assertion failed (this->it == ((const Mat_<_Tp>*)this->it.m)->end()) in cv::MatCommaInitializer_<ch
ar>::operator class cv::Mat_<char>, file g:\chengxu\opencv\opencv\build\include\opencv2\core\mat.inl.hpp, line 3299
OpenCV: terminate handler is called! The last OpenCV error is:
OpenCV(3.4.2) Error: Assertion failed (this->it == ((const Mat_<_Tp>*)this->it.m)->end()) in cv::MatCommaInitializer_<ch
ar>::operator class cv::Mat_<char>, file g:\chengxu\opencv\opencv\build\include\opencv2\core\mat.inl.hpp, line 3299



菜鸡一个，求大佬解答