OpenCV Error: Assertion failed (size.width>0 && size.height>0) in cv::imshow

哪位大神帮我看下我的代码 终端显示出错：
OpenCV Error: Assertion failed (size.width>0 && size.height>0) in cv::imshow, file C:\build\master_winpack-build-win64-vc14\opencv\modules\highgui\src\window.cpp, line 304
具体代码：#include <opencv2/core./core.hpp>
#include <opencv2/highgui./highgui.hpp>
using namespace cv;

int main()
{
Mat girl = imread("girl.jpg");
namedWindow("【1】动漫图");
imshow("【1】动漫图", girl);
    Mat image = imread("dota.jpg", 199);
Mat logo = imread("dota_logo.jpg");
    namedWindow("【2】原画图");
imshow("【2】原画图", image);
    namedWindow("【3】logo图");
imshow("【3】logo图", logo);
    Mat imageROI;
imageROI = image(Rect(800, 350, logo.cols, logo.rows));
addWeighted(imageROI, 0.5, logo, 0.3, 0., imageROI);
namedWindow("【4】原画+logo图");
imshow("【4】原画+logo图", image);
imwrite("由imwrite生成的图片.jpg", image);
waitKey();
return 0;
}
运行出错：


谢谢！