How to fix ( release ) memory problem ? kernelbase.dll error

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#include <iostream>
#include <fstream>
#include <iomanip>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include<opencv\cv.h>
#include<opencv\highgui.h>

using namespace cv;
using namespace std;
int c;
int main(int argc, char* argv[])
{
    ofstream fout("output.txt");
    Mat image = imread("toilet.jpg", CV_LOAD_IMAGE_GRAYSCALE);
    Mat B = image;
    if (image.empty()){
        fout << "Image open fail" << endl;
        exit(1);
    }
        for (int i = 0; i < 320; ++i){
        for (int j = 0; j < 240; ++j){
            //3)
            if ((int)image.at<uchar>(i, j) > 120)
            {c=c+1;}
                fout << setw(3) << " " << (int)image.at<uchar>(i, j);
        }
        fout << endl;
    }
    if (c>3000)
 printf("bright pixel : %d \n AAA", c);
    else
 printf("bright pixel : %d \n BBB", c);
    //4)
    imshow("ML", B);
    //5)
    waitKey(0);
image.release();        // isn't it releasing memory?
B.release();              //
    return 0;

}

please give me some bright answers it's killing me :( because it worked right before a day The error is like figure under.

The error says

Unhandled exception at 0x75915b68 (KernelBase.dll) in opencvtest.exe: Microsoft C++ exception: cv::Exception at memory location 0x0024f558..