C++ does not find QML StackView - c++

Question

I need to push a qml page to stackview from other qml page.
So i am using c++-qml interacting for this problem.
my c++ code finds page item, but does not find stackView.
main.cpp:
int main(int argc, char *argv[])
{
...
QQmlEngine engine;
QQmlComponent component(&engine, QUrl("qrc:/qml/main.qml"));
QObject* object = component.create();
Settings::defineObject(object);
return app.exec();
}
settings.h:
class Settings : public QObject
{
Q_OBJECT
private:
static QObject* object;
public:
...
Q_INVOKABLE void push(QString fileName);
static void defineObject(QObject* obj);
};
settings.cpp:
QObject* Settings::object = nullptr;
...
void Settings::push(QString fileName)
{
if (Settings::object == nullptr) QCoreApplication::exit(-3);
QObject* page = Settings::object->findChild<QObject*>("page");
if (!page) QCoreApplication::exit(-4);
QObject* stackView = page->findChild<QObject*>("stackView");
if (!stackView) QCoreApplication::exit(-5);
QMetaObject::invokeMethod(stackView, "push", Q_ARG(QString, fileName));
}
void Settings::defineObject(QObject* obj)
{
object = obj;
}
main.qml:
ApplicationWindow {
...
Page {
id: page
...
StackView {
id: stackView
initialItem: "Home.qml"
anchors.fill: parent
}
}
}
My program always exits -5 code.