subclassing MainForm class

[mickey]

It seems ok;
I have a problem. In mywidget.cpp constructor I have:

connect(this, SIGNAL(myUpdate()), w, SLOT(myUpdateWidgets()) );

connect(this, SIGNAL(myUpdate()), w, SLOT(myUpdateWidgets()) );

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in main.cpp:

myMainForm w; a.setMainWidget(&w);....

myMainForm w; a.setMainWidget(&w);....

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When I launch app appear this message:

QObject::connect: No such slot MainForm::myUpdateWidgets()
QObject::connect:  (sender name:   'myWidget1')
QObject::connect:  (receiver name: 'MainForm')

QObject::connect: No such slot MainForm::myUpdateWidgets()
QObject::connect:  (sender name:   'myWidget1')
QObject::connect:  (receiver name: 'MainForm')

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myUpdateWidgets() is a SLOT of myMainForm! And not MainForm (base class)
Why doesn't it work? Thanks