Convexity Defects in OpenCV 2.4.2

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Can anyone tell me if convexityDefects() is supported in OpenCV 2.4.2. The documentation says it does but I'm getting an error when trying to use it and I can't seem to find the problem. The error I get is,

convexDefect.cpp: In function ‘cv::Mat contour(cv::Mat)’:
convexDefect.cpp:68:66: error: no match for call to ‘(std::vector<cv::Point_<int> >)
(std::vector<cv::Point_<int> >&, std::vector<cv::Point_<int> >&, 
std::vector<cv::Point_<int> >&)

Can somebody perhaps identify the problem? Below is my code (The code reads in an image, finds the contours, the convex hull and supposed to find the convexity defects).

#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"
#include <fstream>
using std::ifstream;
using std::ofstream;
#include <iostream>
using std::cerr;
using std::cout;
using std::endl;
#include <dirent.h>
#include <cstdlib> 
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string>
using namespace std;
using namespace cv;

Mat contour(Mat image);

int main( int argc, const char** argv )
{
    Mat image = imread( argv[1], 1 );       
    Mat new_image = contour(image);
    imshow("Output", new_image);
    waitKey();      
    return 0;
}

Mat contour(Mat image)
{
    cvtColor(image,image,CV_BGR2GRAY);

    int threshval = 40;
    int max_thresh = 255;
    RNG rng(12345);

    Mat threshold_output;
    vector<vector<Point> > contours;
    vector<Vec4i> hierarchy;

    threshold( image, threshold_output, threshval, 255, THRESH_BINARY );

    findContours(threshold_output, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, Point(0, 0) );

    Mat cimage = Mat::zeros(image.size(), CV_8UC3);

    for(size_t i = 0; i < contours.size(); i++)
    {
        size_t count = contours[i].size();
        if( count < 6 )
            continue;

        Mat pointsf;
        Mat(contours[i]).convertTo(pointsf, CV_32F);
        RotatedRect box = fitEllipse(pointsf);
        if( MAX(box.size.width, box.size.height) > MIN(box.size.width, box.size.height)*30 )
            continue;
        drawContours(cimage, contours, (int)i, Scalar::all(255), 1, 8, vector<Vec4i>(), 0, Point());

         //Convex Hull -------------
         // vector<Point> hullPoints;   
         vector<int> hullIndices; 
         vector<Vec4i> convexityDefects;

        //convexHull(contours[i], hullPoints, true, true);
        convexHull(contours[i], hullIndices, true);
        convexityDefects(contours[i], hullIndices, convexityDefects);

    //int hullcount = (int)hullPoints.size();
        /*for( int j = 1; j < hullcount; j++ )
        {
            line(cimage, hullPoints[j-1], hullPoints[j], Scalar(0, 255, 0), 1, CV_AA);
            circle(cimage,  hullPoints[j], 1, Scalar(0, 0, 255), CV_FILLED, CV_AA);
        }*/
    }
    return cimage;
}