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Hi I'm trying to use cvCompareHist to detect an object entering the frame all the methods seem to be returning a value except for cvCompareHist the code builds succesfully with no errors and crashes at runtime when I quick watch the cvCompreHist method I get an error "CX0017: Error:symbol "cvCompareHist" not found". Here's the code till that point

#include "opencv\cv.h"
#include"opencv2\core\core.hpp" // Basic OpenCV structures (cv::Mat, Scalar)
#include "opencv\highgui.h" // OpenCV window I/O
#include "opencv2\imgproc\imgproc.hpp"

#include <iostream> // for standard I/O
#include <string>   // for strings
#include <iomanip>  // for controlling float print precision
#include <sstream>  // string to number conversion
#include <stdio.h>
    void ImagesAreDifferent(IplImage* frame, IplImage* previousFrame);

    using namespace std;
    using namespace cv;

    int main(int argc, char** argv)
    {
        cvNamedWindow( "Example2", CV_WINDOW_AUTOSIZE ); //creates window
        //CvCapture* capture = cvCreateCameraCapture( -1); //to select camera
        CvCapture* capture = cvCreateFileCapture("test video.mp4"); //uses test video
        IplImage* frame; //holds one frame from the video/camera
        IplImage* referenceFrame = NULL; //will hold the reference frame
        IplImage* currentFrame = NULL;
        IplImage* h_plane = NULL;
        IplImage* s_plane = NULL;
        IplImage* v_plane = NULL;
        IplImage* h_planeC = NULL;
        IplImage* s_planeC = NULL;
        IplImage* v_planeC= NULL;
        IplImage* previousFrame = NULL; //this is used to determine if the object is moving




        /// Using 30 bins for hue and 32 for saturation
        int h_bins = 30; int s_bins = 32;
        // Build and fill the histogram
        CvHistogram* frameA;
        {
            int hist_size[] = { h_bins, s_bins };
            float h_ranges[] = { 0, 255 };
            float s_ranges[] = { 0, 180 };
            float* ranges[] = { h_ranges, s_ranges };
            frameA = cvCreateHist( 2, hist_size, CV_HIST_ARRAY, ranges, 1 );
        }

        CvHistogram* frameB;
        {
            int hist_size[] = { h_bins, s_bins };
            float h_ranges[] = { 0, 255 };
            float s_ranges[] = { 0, 180 };
            float* ranges[] = { h_ranges, s_ranges };
            frameB = cvCreateHist( 2, hist_size, CV_HIST_ARRAY, ranges, 1 );
        }

        bool firstFrame = true;

        while(1) //run indefinitely
        {
            frame = cvQueryFrame( capture ); //takes the next frame 

            //sets the reference frame
            if(firstFrame)
            {
                //these are the three layers from the color scheme we are converting to
                //the change in color scheme is for better comparison
                h_plane = cvCreateImage( cvGetSize(frame), 8, 1);
                s_plane = cvCreateImage( cvGetSize(frame), 8, 1);
                v_plane = cvCreateImage( cvGetSize(frame), 8, 1);
                referenceFrame = cvCreateImage(cvGetSize(frame), 8,3); //set the reference frame
                cvCvtColor(frame, referenceFrame, CV_BGR2HSV);         //change the color scheme
                IplImage* referenceFrameArray[] = {h_plane, s_plane};  //put the h and s layers into an array for creation of the histogram
                cvCvtPixToPlane( referenceFrame, h_plane, s_plane, v_plane, 0); //break the image into the three layers
                cvCalcHist(referenceFrameArray, frameA, 0, 0);         //calculate the histogram value
                cvNormalizeHist( frameA, 1.0);                         //normalize the histogram
                firstFrame = false;
            }
            else
            {
                //these are the three layers from the color scheme we are converting to for current frame
                h_planeC = cvCreateImage( cvGetSize(frame), 8, 1);
                s_planeC = cvCreateImage( cvGetSize(frame), 8, 1);
                v_planeC = cvCreateImage( cvGetSize(frame), 8, 1);
                //get histograms for fast simple comparison of frames
                currentFrame = cvCreateImage(cvGetSize(frame), 8,3);   //set the current frame
                cvCvtColor(frame, currentFrame, CV_BGR2HSV);           //change the color scheme
                IplImage* currentFrameArray[] = {h_planeC, s_planeC};    //put the h and s layer into an array for creation of the histogram
                cvCvtPixToPlane( currentFrame, h_planeC, s_planeC, v_planeC, 0); //break apart the image into the three layers
                cvCalcHist(currentFrameArray, frameB, 0, 0 ...