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The frame is decorated
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java.awt.IllegalComponentStateException: The frame is decorated	at java.awt.Frame.setBackground(Frame.java:986)	at javax.swing.JFrame.frameInit(JFrame.java:259)	at javax.swing.JFrame.(JFrame.java:181)	at NapKin.(NapKin.java:17)	at NapKin.main(NapKin.java:76)