SLIC issues while using

I am getting the following error while executing the code stated below. I have linked the libraries properly and the code builds fine. my code is stated below:

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


    Mat img, frame, result, mask, converted;


    int region_size = 12;
    int ruler = 10;
    int min_element_size = 50;
    int num_iterations = 10;


    if (argc == 1) {
        cout << "Usage: " << argv[0] << " image.jpg" << endl;
        return -1;
    }
    else {
        cout << "the image you are processing: " << argv[1] << endl;
        img = imread(argv[1]);
        if (img.empty()) {
            cout << "Error loading the image" << endl;
            return -1;
        }
    }

    /*img= imread("image.jpg", IMREAD_COLOR);*/

    imshow("Input", img);


    img.copyTo(frame);
    cvtColor(frame, converted, COLOR_BGR2HSV);

    Ptr<SuperpixelSLIC> slic = createSuperpixelSLIC(converted, MSLIC, region_size, float(ruler));

    slic->iterate(num_iterations);
    slic->enforceLabelConnectivity(min_element_size);


    cout <<"There are Total"<< slic->getNumberOfSuperpixels() << " superpixels" << endl;

    // get the contours for displaying
    slic->getLabelContourMask(mask, true);
    result.setTo(Scalar(0, 0, 255), mask);

    // display output
    //superpixel contours
    imshow("superpixel contours", result);
    imshow("Mask", mask);
    Mat labels;
    slic->getLabels(labels);
    const int num_label_bits = 2;
    labels &= (1 << num_label_bits) - 1;
    labels *= 1 << (16 - num_label_bits);
    imshow("Labels", labels);
    waitKey(0); 
}

while executing the code i get the following error:

0xC0000005: Access violation reading location 0x00000000.