collect2: ld returned 1 exit status

[assismvla]

I'm receive this error :

collect2: ld returned 1 exit status

I just have this ...

//.pro file

# -------------------------------------------------
# Project created by QtCreator 2009-05-24T21:09:57
# -------------------------------------------------
TARGET = Cyne
CONFIG += console
CONFIG -= app_bundle
TEMPLATE = app
SOURCES += main.cpp \
cynemain.cpp
HEADERS += cynemain.h

//cynemain.h

#ifndef CYNEMAIN_H
#define CYNEMAIN_H

#include <QMainWindow>

class CyneMain : public QMainWindow
{
Q_OBJECT

public:
CyneMain();
protected:
void closeEvent(QCloseEvent *event);
};

#endif // CYNEMAIN_H

//cynemain.cpp

#include <QtGui>
#include "cynemain.h"

CyneMain::CyneMain()
{
}

//main.cpp

#include <QtCore/QCoreApplication>
#include "cynemain.h"

int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
CyneMain ap;
ap.show();
return a.exec();
}

other question :

Qt Creator is very slow . why ? (run win vista)

[rogerholmes]

it looks like you declared
void closeEvent(QCloseEvent *event); in header

and did not implement it in.cpp