Unhandled exception at 0x774de3be (ntdll.dll)

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I use a program I found in the tutorial on opencv but when I debug the program I get this error

Unhandled exception at 0x774de3be (ntdll.dll) in test_4.exe: 0xC0000005: Access violation reading location 0x580c8e68.

I am still a beginner in using opencv can anyone who know the solution help me? this is the code

#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "highgui.h"
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>

using namespace cv;

/// Global variables
Mat src, erosion_dst, dilation_dst;

int erosion_elem = 0;
int erosion_size = 0;
int dilation_elem = 0;
int dilation_size = 0;
int const max_elem = 2;
int const max_kernel_size = 21;

/** Function Headers */
void Erosion( int, void* );
void Dilation( int, void* );

/** @function main */
int main( int argc, char** argv )
{
  /// Load an image
  src = imread( "D:/lena.jpg" );
 // imshow("Image", src);


  if( !src.data )
  { return -1; }

  /// Create windows
  namedWindow( "Erosion Demo", CV_WINDOW_AUTOSIZE );
  namedWindow( "Dilation Demo", CV_WINDOW_AUTOSIZE );
  cvMoveWindow( "Dilation Demo", src.cols, 0 );

  /// Create Erosion Trackbar
  createTrackbar( "Element:\n 0: Rect \n 1: Cross \n 2: Ellipse", "Erosion Demo",
                  &erosion_elem, max_elem,
                  Erosion );

  createTrackbar( "Kernel size:\n 2n +1", "Erosion Demo",
                  &erosion_size, max_kernel_size,
                  Erosion );

  /// Create Dilation Trackbar
  createTrackbar( "Element:\n 0: Rect \n 1: Cross \n 2: Ellipse", "Dilation Demo",
                  &dilation_elem, max_elem,
                  Dilation );

  createTrackbar( "Kernel size:\n 2n +1", "Dilation Demo",
                  &dilation_size, max_kernel_size,
                  Dilation );

  /// Default start
  Erosion( 0, 0 );
  Dilation( 0, 0 );

  waitKey(0);
  return 0;
}

/**  @function Erosion  */
void Erosion( int, void* )
{
  int erosion_type;
  if( erosion_elem == 0 ){ erosion_type = MORPH_RECT; }
  else if( erosion_elem == 1 ){ erosion_type = MORPH_CROSS; }
  else if( erosion_elem == 2) { erosion_type = MORPH_ELLIPSE; }

  Mat element = getStructuringElement( erosion_type,
                                       Size( 2*erosion_size + 1, 2*erosion_size+1 ),
                                       Point( erosion_size, erosion_size ) );

  /// Apply the erosion operation
  erode( src, erosion_dst, element );
  imshow( "Erosion Demo", erosion_dst );
}

/** @function Dilation */
void Dilation( int, void* )
{
  int dilation_type;
  if( dilation_elem == 0 ){ dilation_type = MORPH_RECT; }
  else if( dilation_elem == 1 ){ dilation_type = MORPH_CROSS; }
  else if( dilation_elem == 2) { dilation_type = MORPH_ELLIPSE; }

  Mat element = getStructuringElement( dilation_type,
                                       Size( 2*dilation_size + 1, 2*dilation_size+1 ),
                                       Point( dilation_size, dilation_size ) );
  /// Apply the dilation operation
  dilate( src, dilation_dst, element );
  imshow( "Dilation Demo", dilation_dst );
}