QObject::connect

[littlepig]

Hi there

I'm having a problem to connect QObjects... I've searched on web a lot and none of the finds seen to help the problem.

I have a class

class MainWindow : public QMainWindow
{
	Q_OBJECT
/* code here */
public slots:
        void changeWindow(int);
}

class MainWindow : public QMainWindow
{
	Q_OBJECT
/* code here */
public slots:
        void changeWindow(int);
}

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another class

class MainMenu : public QWidget
{
	Q_OBJECT
private:
	QPushButton *optionsB;
/* code here */
public:
        void setup(MainWindow*window);
};

class MainMenu : public QWidget
{
	Q_OBJECT
private:
	QPushButton *optionsB;
/* code here */
public:
        void setup(MainWindow*window);
};

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where setup have:

void MainMenu::setup(MainWindow* mainWindow)
{
/* code here */
 
 
	QSignalMapper* signalMapper = new QSignalMapper(this);
	signalMapper->setMapping(optionsB, int(1));
 
	QObject::connect(optionsB, SIGNAL(clicked()),signalMapper, SLOT (map()));
	QObject::connect(signalMapper, SIGNAL(mapped(int)), mainWindow, SLOT(changeWindow(int))); // line 50
}

void MainMenu::setup(MainWindow* mainWindow)
{
/* code here */

	
	QSignalMapper* signalMapper = new QSignalMapper(this);
	signalMapper->setMapping(optionsB, int(1));
	
	QObject::connect(optionsB, SIGNAL(clicked()),signalMapper, SLOT (map()));
	QObject::connect(signalMapper, SIGNAL(mapped(int)), mainWindow, SLOT(changeWindow(int))); // line 50
}

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And the following runtime error:

Object::connect: No such slot MainWindow::changeWindow(int) in /Users/jorgecarleitao/Trabalho_Outros/qt/teste/mainmenu.cpp:50
Object::connect: (receiver name: 'MainWindow')

Can someone explain to me what is wrong here? I'm 2 days searching for this problem and I can't find the solution...