Error « JSlider « Java Swing Q&A

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1. Java Swing JSlider addChangeListener error    stackoverflow.com

I am using Swing to make a simple GUI but when I add a change listener to a JSlider, I get the following runtime error: 

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

2. JSlider error, but no clue where it's coming from    stackoverflow.com

At some point in my program, the following error is being generated. Any idea what this is? 

  Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
        ...