Why doesn't this work? (IconImage)

Question

So I want that instead of the cup of coffe in my JFrame I want a icon but it won't pop up for some reason could someone help me?

Script:
setIconImage(new ImageIcon("/Click counter/Images/error.png").getImage());

Answer 1

You can use this to change the icon:

Image icon = Toolkit.getDefaultToolkit().getImage("your image");

frame.setIconImage(icon);

Answer 2

What are the dimensions of said image?