problem running and debugging using qt under windows

Hi,
I have downloaded boundle windows package including qt 5.6.2, qt creator 4.0.3 and MingW 4.9.2 (qt-opensource-windows-x86-mingw492-5.6.2.exe)
The I started a simple qt application

dialog.cpp

Code:

---

#include "dialog.h"
#include "ui_dialog.h"
 
Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
}
 
Dialog::~Dialog()
{
    delete ui;
}

---

dialog.h

Code:

---

#ifndef DIALOG_H
#define DIALOG_H
 
#include <QDialog>
 
namespace Ui {
class Dialog;
}
 
class Dialog : public QDialog
{
    Q_OBJECT
 
public:
    explicit Dialog(QWidget *parent = 0);
    ~Dialog();
 
private:
    Ui::Dialog *ui;
};
 
#endif // DIALOG_H

---

main.cpp

Code:

---

#include "dialog.h"
#include <QApplication>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Dialog w;
    w.show();
 
    return a.exec();
}

---

dialog.ui

Code:

---

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>Dialog</class>
 <widget class="QDialog" name="Dialog">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>400</width>
    <height>300</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Dialog</string>
  </property>
  <layout class="QGridLayout" name="gridLayout">
   <item row="0" column="0">
    <widget class="QPushButton" name="pushButton">
     <property name="text">
      <string>PushButton</string>
     </property>
    </widget>
   </item>
  </layout>
 </widget>
 <layoutdefault spacing="6" margin="11"/>
 <resources/>
 <connections/>
</ui>

---

it compiles, but when I try to Run it fails with this message:

Code:

---

Starting C:\Documents and Settings\massimiliano\progs\build-test-Desktop_Qt_5_6_2_MinGW_32bit-Debug\debug\test.exe...
The program has unexpectedly finished.
C:\Documents and Settings\massimiliano\progs\build-test-Desktop_Qt_5_6_2_MinGW_32bit-Debug\debug\test.exe crashed.

---

and when I try to debug I have this error:
Attachment 12321

What is wrong with my setup?

best regards
max