Access violation using flann matcher - c++

Question

I'm facing a very annoying problem when I create an object of FalnnBaseMatcher.
The code is the following and it worked fine on ubuntu under eclipse.
#include <iostream>
#include "C:\openCv\opencv\build\include\opencv2\core\core.hpp"
#include "C:\openCv\opencv\build\include\opencv2\highgui\highgui.hpp"
#include "C:\openCv\opencv\build\include\opencv2\imgproc\imgproc.hpp"
#include "C:\openCv\opencv\build\include\opencv2\features2d\features2d.hpp"
#include "C:\openCv\opencv\build\include\opencv2\nonfree\nonfree.hpp"
using namespace std;
using namespace cv;
int main(){
cv::VideoCapture cap("video2.mp4");
if(!cap.isOpened()){ // check if we succeeded
return -1;
}
Mat frame; // creates the object frame
FlannBasedMatcher matcher; //create object matcher
return 0;
}
it compiles but when i run i got an access violation. I tried to split the problem and i figured out that i have this error when i create the object FlannBasedMatcher matcher;
Any help is accepted, thank you very much.
I'm using visual studio express edition 2012 and opencv 242 under windows 7.
Now modifying slightly the code I get an interuption in free.c
/***
*free.c - free an entry in the heap
*
* Copyright (c) Microsoft Corporation. All rights reserved.
*
*Purpose:
* Defines the following functions:
* free() - free a memory block in the heap
*
*******************************************************************************/
#include <cruntime.h>
#include <malloc.h>
#include <winheap.h>
#include <windows.h>
#include <internal.h>
#include <mtdll.h>
#include <dbgint.h>
#include <rtcsup.h>
/***
*void free(pblock) - free a block in the heap
*
*Purpose:
* Free a memory block in the heap.
*
* Special ANSI Requirements:
*
* (1) free(NULL) is benign.
*
*Entry:
* void *pblock - pointer to a memory block in the heap
*
*Return:
* <void>
*
*******************************************************************************/
void __cdecl _free_base (void * pBlock)
{
int retval = 0;
if (pBlock == NULL)
return;
RTCCALLBACK(_RTC_Free_hook, (pBlock, 0));
retval = HeapFree(_crtheap, 0, pBlock);
if (retval == 0)
{
errno = _get_errno_from_oserr(GetLastError());
}
}
The interruption is in: if (retval == 0)
SOLVED!
I rebuilt openCv for VisualStudio 2012 using cMake and now works fine.