connect() problem

[Pawello]

Because you're using the private member function outside the class.

void NowyWpis::Wybor ()

void NowyWpis::Wybor ()

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If you mean that problem is because of making Wybor() private function, it's not reason of error- I made everrything in class public:

public:
NowyWpis(QWidget *parent = 0);
public slots:
void Aktual();
public:
void Wybor ();
void Dane();
QGroupBox *wybortr;
QComboBox *wybierz;
QLabel *ikona;
QString wybrany;

public:
NowyWpis(QWidget *parent = 0);
public slots:
void Aktual();
public:
void Wybor ();
void Dane();
QGroupBox *wybortr;
QComboBox *wybierz;
QLabel *ikona;
QString wybrany;

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but it didn't solve the problem