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

QT Creator End of configuration OpenCV Then use the display picture demo When testing ：

#include "mainwindow.h"
#include <QApplication>
#include <opencv2/opencv.hpp>
using namespace cv;

int main(int argc, char *argv[])
{
    
    Mat myImage = imread(":/left3.jpg"); // Added to the resource file + Relative paths 
     perhaps 
    Mat myImage = imread("E:\\left3.jpg");  Put it in E The absolute path under the disk + No resource file added 
     perhaps 
    Mat myImage = imread("E:\\ picture \\left3.jpg"); Put it in E The absolute path under the disk + No resource file added + Path contains Chinese 

    namedWindow("DEMO",CV_WINDOW_AUTOSIZE);
    imshow("DEMO",myImage);
    waitKey(0);
    return 0;
}

The following error has been reported ：

OpenCV Error: Assertion failed (size.width>0 && size.height>0) in imshow, file E:\Opencv3.1.0\Windows\opencv\sources\modules\highgui\src\window.cpp, line 289
terminate called after throwing an instance of 'cv::Exception' what():  E:\Opencv3.1.0\Windows\opencv\sources\modules\highgui\src\window.cpp:289: error: (-215) size.width>0 && size.height>0 in function imshow

Here are the following points ：

Code	features	Whether it is right
Mat myImage = imread(“E:\MyQtProject\demo\left3.jpg”);	Added to the resource file + Absolute path	yes
Mat myImage = imread(":/left3.jpg");	Added to the resource file + Relative paths	no
Mat myImage = imread(“E:\left3.jpg”);	Put it in E The absolute path under the disk + No resource file added	no
Mat myImage = imread(“E:\ picture \left3.jpg”);	Put it in E The absolute path under the disk + No resource file added + Path contains Chinese	no

The following code runs correctly ：

#include "mainwindow.h"
#include <QApplication>
#include <opencv2/opencv.hpp>
using namespace cv;

int main(int argc, char *argv[])
{
    
    Mat myImage = imread("E:\\MyQtProject\\demo\\left3.jpg");  Added to the resource file + Absolute path 
    namedWindow("DEMO",CV_WINDOW_AUTOSIZE);
    imshow("DEMO",myImage);
    waitKey(0);
    return 0;
}