What happens to exception when C + + uses similar OpenCV encapsulation libraries?

Previously written code exception is F10 look at the variable to find the error. Now with the OpenCV library, the exception information is too limited, do not know how to deal with, tried a lot of programs are abnormal interruption.

For example, this piece of code is wrong?

Include <iostream>include <opencv2/opencv.hpp>

using namespace CV;
using namespace Std;

void Meanstddev_test ()
{

Constchar* imagename ="Boy";Generate grayscale graph Mat img = imread (imagename); Mat Gray, Color;cvtcolor (img, Gray, Cv_rgb2gray);cout <<"Channel:" << gray.channels () <<ENDL; Mat Tmp_m, TMP_SD; double m = 0, SD = 0;m = Mean (gray) [ Span class= "Hljs-number" >0]; cout <<  "Mean:" << m < < endl;meanstddev (Gray, Tmp_m, tmp_sd); m = Tmp_m.at< Double> (0, 0); sd = tmp_sd.at< double> (0, 0); cout << " Mean: "www.rcsx.org  << m << ENDL;   

}

int main () {

meanStdDev_test();waitKey();

}

Find c:/build/below ... No such path?

What happens to exception when C + + uses similar OpenCV encapsulation libraries?