java.lang.NullPointerException: This exception has no message.

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via Terracotta by Admin, 1 year ago
This exception has no message.
java.lang.NullPointerException:
at javax.swing.DefaultBoundedRangeModel.addChangeListener(Unknown Source)
at javax.swing.JSlider.setModel(Unknown Source)
at javax.swing.JSlider.(Unknown Source)
at demo.Slider.(Slider.java:18)
at demo.Slider.main(Slider.java:11)

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