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I tried to do this at those lines, but it didn't work.

Icon b = new ImageIcon(getClass().getResource("C:\Users\Nicklas\Dropbox\Eclipse\WorkSpace Done\Code Reminder\src\b.png"));
Icon x = new...

It is the whole error... and the whole code. Just look under: "The Error / Console"

My "program" won't run. It just shows an error.

I can't see why my code aren't working. (I'm still learning Java)
Please help me.

The Error / Console:

Exception in thread "main" java.lang.NullPointerException
at...