I don't know why it's not passing? Klasa Ludzie musi mieć cztery pola. -> there are only 4 fields declared Klasa Ludzie musi mieć jedną metod -> there is only .toString() (i was wondering if constructor was the second but when removed it didn't helped). Klasa Solution musi mieć jedną metodę. -> there is only main(String[] args) method