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Unhandled exception in dgbheap.c

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Im trying to do a neural network (its now like the fifth rewrite or something, hehe [smile]). Problem is, when I run it, I get an unhandled exception in dgbheap.c so I dont know what line in my code that causes it. When I step through the code the error occurs on the return line in main.
#include <iostream>
#include <conio.h>

#include "NeuralNet.h"

int main() {
	NeuralNet X(2, 2, 1);

	cout << X.Process();

	return 1;

The NeuralNet class's deconstructor doesnt have any code, the class doesnt have any pointers so I dont have to delete anything manually (i think).
#ifndef _NEURAL_NET
#define _NEURAL_NET

#include <vector>
#include <iostream>
#include <time.h>
#include <math.h>

using namespace std;

class NeuralNet {
	vector<vector<float> > W;	// weights 
	vector<vector<float> > X;	// the neurons outputs

	int Inputs, NeuronsInHidden, Outputs;

			NeuralNet(int _Inputs, int _NeuronsInHidden, int _Outputs);

	float	Process();

	float	x(int l, int n);		// output x in layer l from neuron n
	float	w(int l, int f, int n);	// weight of input f (bias = 0) for neuron n in layer l

	float	Sigmoid(float num)	{return (float)(1/(1+exp(-num)));}


Any ideas of what could be causing this error?

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@superpig: "Unhandled exception at 0x7c901230 in BPNet2.exe: User breakpoint" is the window that pops up. The only other output window I can think of is the that of the compilation but the program compiles just fine.

@SiCrane: I dont write to any vectors after main returns (obviously), you still think that could be the problem?

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What's probably happening is that the debug heap is detecting heap corruption when freeing memory in the vectors, which happens when main exists and the vectors in your neural net class are destroyed. The most likely cause of heap corruption when using vectors is writing past the end.

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I've been confused over that error too many times. A good tip is to check the stack trace to see which part of your/their code that causes the error. Last time I got that error I had some multithreading synchonization errors which made my vector-iterators go past the end of the vector.

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