Program crashes when radioButton selected

[ebsaith]

Done some modifying on code... to no avail though

Basically I need to check which radio button selected
The Problem -> RadioButton in main dialog Class(Window)
-> the Check statement is in a different class("label class" within Window/dialog)

Created signals & slots as:

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
    connect(ui->radioButton_1, SIGNAL(n1_Selected()), my_qlabel, SLOT(my_qlabel::HandleN1()));
    connect(ui->radioButton_2, SIGNAL(n2_Selected()), my_qlabel, SLOT(my_qlabel::HandleN2()));
...
}

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
    connect(ui->radioButton_1, SIGNAL(n1_Selected()), my_qlabel, SLOT(my_qlabel::HandleN1()));
    connect(ui->radioButton_2, SIGNAL(n2_Selected()), my_qlabel, SLOT(my_qlabel::HandleN2()));
...
}

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in dialog:

void Dialog::on_radioButton_1_clicked()
{
    emit n1_Selected();
}
 
void Dialog::on_radioButton_2_clicked()
{
   emit n2_Selected();
 }

void Dialog::on_radioButton_1_clicked()
{
    emit n1_Selected();
}

void Dialog::on_radioButton_2_clicked()
{
   emit n2_Selected();
 }

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my slots in sub class (label class)
.h

private slots:
    void HandleN1();
    void HandleN2();

private slots:
    void HandleN1();
    void HandleN2();

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.cpp

void my_qlabel::HandleN1()
{
  //calculations
}
 
void my_qlabel::HandleN2()
{
  //diff-calculations
}

void my_qlabel::HandleN1()
{
  //calculations
}

void my_qlabel::HandleN2()
{
  //diff-calculations
}

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Above not working!
Where am I going wrong?
How do I fix it?

Thanks