Hello, everyone. I've got problem with detecting face. When I use CascadeClassifier.Detectmultiscale(gray,faces,1.1,2) I have the error in std::algorithm Access Reading Violation. I'm using OpenCv 3.4.6 and c++. It's code(P.S. It delay camera it's take picture and detect):

include "opencv2/opencv.hpp"

include "opencv2/objdetect/objdetect.hpp"

include "opencv2/imgproc/imgproc.hpp"

include <iostream>

include "windows.h"

using namespace cv; using namespace std;

int main(int argc, char** argv) {

String face_cascade_name = "C:\Opencv-3.4.6\sources\data\haarcascades\haarcascade_frontalface_default.xml"; CascadeClassifier face_cascade; RNG rng(12345); Mat image; face_cascade.load(face_cascade_name);

if (face_cascade.empty())
{
    cerr << "NOP!" << endl;
}


namedWindow("Camera", WINDOW_AUTOSIZE);
int delay;
cout << "Write the delay: ";
cin >> delay;
VideoCapture png(0);

if (!png.isOpened())  // check if we succeeded
    return -1;



Sleep(delay * 1000);
png >> image;

vector<Rect> faces;
Mat gray;
cvtColor(image, gray, COLOR_BGR2GRAY);
equalizeHist(gray, gray);
face_cascade.detectMultiScale(gray, faces, 1.1, 2);


imshow("Camera", image);

waitKey(0);

} Help me as soon as it possible.
Best Regards, TheGamerCoder.

Hello, everyone. I've got problem with detecting face. When I use CascadeClassifier.Detectmultiscale(gray,faces,1.1,2) I have the error in std::algorithm Access Reading Violation. I'm using OpenCv 3.4.6 and c++. It's code(P.S. It delay camera it's take picture and detect):

#include "opencv2/opencv.hpp"
#include "opencv2/objdetect/objdetect.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <iostream>
#include "windows.h"
using namespace cv;
using namespace std;
 
std;

int main(int argc, char** argv) {
 
{

String face_cascade_name = "C:\Opencv-3.4.6\sources\data\haarcascades\haarcascade_frontalface_default.xml";
"C:\\Opencv-3.4.6\\sources\\data\\haarcascades\\haarcascade_frontalface_default.xml";
    CascadeClassifier face_cascade;
    RNG rng(12345);
    Mat image;
    face_cascade.load(face_cascade_name);
 
face_cascade.load(face_cascade_name);

    if (face_cascade.empty())
 {
     cerr << "NOP!" << endl;
 }


 namedWindow("Camera", WINDOW_AUTOSIZE);
 int delay;
 cout << "Write the delay: ";
 cin >> delay;
 VideoCapture png(0);

 if (!png.isOpened())  // check if we succeeded
     return -1;



 Sleep(delay * 1000);
 png >> image;

 vector<Rect> faces;
 Mat gray;
 cvtColor(image, gray, COLOR_BGR2GRAY);
 equalizeHist(gray, gray);
 face_cascade.detectMultiScale(gray, faces, 1.1, 2);


 imshow("Camera", image);

 waitKey(0);


}
 
}
Help me as soon as it possible. 

Best Regards,
TheGamerCoder.