QConnect find no such slot on QCombobox by Qt Creater - c++

Question

I create a window which inherits from QWidget
I set a grid layout to that Window
I make a function called handleHeroChange(int index) in public slot inside that window
I add a Qcombobox to call the function handleHeroChange(int index).
Qtcreator keeps telling:
**QObject::connect: No such slot QWidget::handleHeroChange(int) in ../Testing/Window.cpp:92**
What did i do wrong?
THE CODE:
//Window.h
class Window : public QWidget
{
QGraphicsPixmapItem* avatar;
QGraphicsTextItem* heroNameItem;
QGraphicsTextItem* heroStrItem;
QGraphicsTextItem* heroDexItem;
QGraphicsTextItem* herointelItem;
public:
Window(QWidget *parent = 0);
public slots:
void handleHeroChange(int);
};
//Window.cpp
Window::Window(QWidget *parent)
: QWidget(parent)
{
QGridLayout *grid = new QGridLayout(this);
QComboBox *comboHeroClass = new QComboBox();
comboHeroClass->addItem("Witcher");
comboHeroClass->addItem("Maurander");
comboHeroClass->setCurrentIndex(1);
grid->addWidget(comboHeroClass, 2,3,1,1);
QComboBox::connect(comboHeroClass, SIGNAL(currentIndexChanged(int)),this, SLOT(handleHeroChange(int)));
}
void Window::handleHeroChange(int index){
QPixmap myImage;
if(index == 0){
}else if(index == 1){
}
}

Answer 1

class Window : public QWidget
{
Q_OBJECT
Add Q_OBJECT macro without semicolon to your class and rebuild your project.
Without this macro moc cannot find your class and doesn't create your slot(and some other things) That's why you get your error: you see your slot but it doesn't exist and you get runtime error