Exit Code 3

[RSX]

Not sure if it's right board but it concerns Qt so... I got this code:

// main.h
 
#include "ui.h"
 
class Main {
public:
    Main()
    {
    }
 
    void init() {
        ui.show();
    }
private:
    UI ui;
};

// main.h

#include "ui.h"

class Main {
public:
    Main()
    {
    }

    void init() {
        ui.show();
    }
private:
    UI ui;
};

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// main. cpp
 
#include "main.h"
#include <QtGui/QApplication>
 
Main g_main;
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
 
    g_main.init();
 
    return a.exec();
}

// main. cpp

#include "main.h"
#include <QtGui/QApplication>

Main g_main;

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    g_main.init();

    return a.exec();
}

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And the problem is that creating g_main as a global variable gives me this:
URL removed

With some console errors:

Invalid parameter passed to C runtime function.
Invalid parameter passed to C runtime function.
Exited with code 3

Invalid parameter passed to C runtime function.
Invalid parameter passed to C runtime function.
Exited with code 3

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When I put Main g_main as a local variable into main() function then everything works fine. Moreover, in another project (without Qt) I have no such problem.

I'm using Qt 4.7.0 with MingW.