cv::Exception at memory location 0x000000484DBDDFA0. [closed]

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When i run my program in VS 2015 this is the error im getting :

Unhandled exception at 0x00007FFA3A268B9C in opencv.exe: Microsoft C++ exception: cv::Exception at memory location 0x000000484DBDDFA0.

my program is :

#include <stdio.h>  
#include <opencv/cv.h>  
#include <opencv/highgui.h>  
#include <opencv/cxcore.h>  
/*------ Declaration des variables globales ------*/
char key;
CvHaarClassifierCascade *cascade;
CvMemStorage *storage;
/*---------- Declaration des fonctions -----------*/
void detectFaces(IplImage *img);
/*------------------------------------------------*/
int main(void)
{
    /* Declaration des variables */
    CvCapture *capture;
    IplImage *img;
    const char *filename = "C:Users\Acer\Desktop\faceDetect\haarcascade_frontalface_alt.xml";

    /* Chargement du classifieur */
    cascade = (CvHaarClassifierCascade*)cvLoadHaarClassifierCascade(filename, cvSize(24, 24));

    /* Ouverture du flux video de la camera */
    capture = cvCreateCameraCapture(-1);

    // Ouverture d'un fichier video  
    //capture = cvCreateFileCapture("C:Users\Acer\Desktop\faceDetect\cam.avi");  

    /* Initialisation de l'espace memoire */
    storage = cvCreateMemStorage(0);

    /* Creation d'une fenetre */
    cvNamedWindow("Window-FT", 1);

    /* Boucle de traitement */
    while (key != 'q')
    {
        img = cvQueryFrame(capture);
        detectFaces(img);
        key = cvWaitKey(10);
    }

    /* Liberation de l'espace memoire*/
    cvReleaseCapture(&capture);
    cvDestroyWindow("Window-FT");
    cvReleaseHaarClassifierCascade(&cascade);
    cvReleaseMemStorage(&storage);

    return 0;
}
/*------------------------------------------------*/
void detectFaces(IplImage *img)
{
    /* Declaration des variables */
    int i;
    CvSeq *faces = cvHaarDetectObjects(img, cascade, storage, 1.1, 3, 0, cvSize(40, 40));

    for (i = 0; i<(faces ? faces->total : 0); i++)
    {
        CvRect *r = (CvRect*)cvGetSeqElem(faces, i);
        cvRectangle(img, cvPoint(r->x, r->y), cvPoint(r->x + r->width, r->y + r->height), CV_RGB(255, 0, 0), 1, 8, 0);
    }

    cvShowImage("Window-FT", img);
}