Undefined reference to vtable in Qt Widgets [Codeblocks]

Question

I'm getting the error "reference undefined to "vtable for FlussoAudio" in this code, i can't find a reason for this error.

FlussoAudio.cpp

#include <QtGui>
#include <QWidget>
#include "FlussoAudio.h"

FlussoAudio::FlussoAudio(QWidget *parent)
     : QWidget(parent)
{
    //...Buttons and Layout...
    setWindowTitle(tr("Lettore Audio"));
    resize(500,400);
}

FlussoAudio.h

#ifndef FLUSSOAUDIO_H

#define FLUSSOAUDIO_H

#include <QWidget>

class FlussoAudio : public QWidget
{
    Q_OBJECT

public:
    explicit FlussoAudio (QWidget *parent = 0);
};

#endif

Main.cpp

#include <QApplication>
#include "FlussoAudio.h"
int main (int argc, char *argv[])
{
    QApplication app(argc,argv);
    FlussoAudio Audio;
    Audio.show();
    return app.exec();
}

The Build messages are these:

/FlussoAudio.cpp|10|reference undefined to "vtable for FlussoAudio"|
/FlussoAudio.cpp|10|reference undefined to "vtable for FlussoAudio"|
/FlussoAudio.h|10|reference undefined to "FlussoAudio::staticMetaObject"|
/FlussoAudio.h|8|reference undefined to "vtable for FlussoAudio"|
/FlussoAudio.h|8|reference undefined to "vtable for FlussoAudio"|

I'm using codeblocks and g++ on Arch Linux.

Answer 1

The macro Q_OBJECT is mean, if not used in a moc compilation. Erase the line or comment it // Q_OBJECT

Regarding moc: http://harmattan-dev.nokia.com/docs/library/html/qt4/moc.html