Qt : cannot connect signal and slot in 2 custom classes - qt

Question

I have problems with signal -> slot between custom classes
The definition of parameters class
class Parameters : public QObject
{
Q_OBJECT
public:
//public stuff
private slots:
void NewValue(int Index, QVariant Value);
private:
//private stuff
}
The definition of qNumedit class
class QNumEdit : public QLineEdit
{
Q_OBJECT
public:
//public stuff
signals:
void ValueChanged(int ,QVariant);
private:
//private stuff
}
In QnumEdit i emit a signal
emit ValueChanged(1,2);`
this is my slot function
void Parameters::NewValue(int Index, QVariant Value)
{
qDebug() << "NewValue " << Index << Value;
}
this is a static test function
void test(int Index, QVariant Value)
{
qDebug() << "test " << Index << Value;
}
This is the way I connect both
QNumEdit* e = new QNumEdit(QMetaType::Double, i);
QObject::connect(e,&QNumEdit::ValueChanged,this,&Parameters::NewValue); //DOES NOT WORK
QObject::connect(e,&QNumEdit::ValueChanged,test); //THIS WORKS OK!!!`
The slot function NewValue is never triggered
The static function Test is triggered
When I do the same thing, but the receiving class is my mainwindow, everything is OK.
Any idea ?