NullPointerExcepter, why did my code suddenly stopped working?

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException: Cannot invoke "java.net.URL.toExternalForm()" because "location" is null.

The error is from this line of code:

home.addItem(new ModelItem(ID++, "Original Nuggets Meal", "", 90, "KFC", new ImageIcon(getClass().getResource("icon/img2.png"))));

i use the correct folder as it is in a package in the same source of the file. please help!

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