I'm a newbie using Opencv 3.0 . I keep getting access violation error and i don't know how to fix it. Please help!!!!

// app1.cpp : Defines the entry point for the console application.

include "stdafx.h"

include <opencv2 core="" core.hpp="">

include <opencv2 highgui="" highgui.hpp="">

include "opencv2/imgproc/imgproc.hpp" // has cvtColor

include <iostream>

include <stdio.h>

using namespace cv; using namespace std;

int main(int argc, char** argv) { Mat src, src_gray;

/// Read the image
  src = imread("Tennisball2.PNG",1);

if (!src.data)
{
    cout << "EMPTY" << endl;
    return -1;
}

/// Convert it to gray
cvtColor(src, src_gray, COLOR_BGR2GRAY);

/// Reduce the noise so we avoid false circle detection
GaussianBlur(src_gray, src_gray, Size(9, 9), 2, 2);

vector<Vec3f> face;

/// Apply the Hough Transform to find the circles
HoughCircles(src_gray, face, HOUGH_GRADIENT, 1, src_gray.rows / 8, 200, 100, 0, 0);
//waitKey(1000);

/// Draw the circles detected
for (size_t  i = 0;  i < face.size() ; i++)
{
Point center(cvRound(face[i][0]), cvRound(face [i][1]));
int radius = cvRound(face [i][2]);
// circle center
circle(src, center, 3, Scalar(0, 255, 0), -1, 8, 0);
// circle outline
circle(src, center, radius, Scalar(0, 0, 255), 3, 8, 0);
}

/// Show your results
namedWindow("Hough Circle Transform Demo", WINDOW_AUTOSIZE);
imshow("Hough Circle Transform Demo", src);

waitKey(33);
return 0;

}

I'm a newbie using Opencv 3.0 . I keep getting access violation error and i don't know how to fix it. Please help!!!!

// app1.cpp : Defines the entry point for the console application.

src_gray;

    /// Read the image
   src = imread("Tennisball2.PNG",1);

 if (!src.data)
 {
     cout << "EMPTY" << endl;
     return -1;
 }

 /// Convert it to gray
 cvtColor(src, src_gray, COLOR_BGR2GRAY);

 /// Reduce the noise so we avoid false circle detection
 GaussianBlur(src_gray, src_gray, Size(9, 9), 2, 2);

 vector<Vec3f> face;

 /// Apply the Hough Transform to find the circles
 HoughCircles(src_gray, face, HOUGH_GRADIENT, 1, src_gray.rows / 8, 200, 100, 0, 0);
 //waitKey(1000);

 /// Draw the circles detected
 for (size_t  i = 0;  i < face.size() ; i++)
 {
 Point center(cvRound(face[i][0]), cvRound(face [i][1]));
 int radius = cvRound(face [i][2]);
 // circle center
 circle(src, center, 3, Scalar(0, 255, 0), -1, 8, 0);
 // circle outline
 circle(src, center, radius, Scalar(0, 0, 255), 3, 8, 0);
 }

 /// Show your results
 namedWindow("Hough Circle Transform Demo", WINDOW_AUTOSIZE);
 imshow("Hough Circle Transform Demo", src);

 waitKey(33);
 return 0;
}