D.click on dist/ name .jar is not working, why?

Hi,
After the project was build, i enter the project folder to run the jar
in the dist/<name>.jar
it doesn't work, therefore i can't run my html applet,
please help,
i am using :
netbeans 5.5.

i get this when i run the jar
java -jar gameapp021565320.jarException in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.ImageIcon.<init>(Unknown Source)
at gameapp021565320.mySecondPanel.<init>(mySecondPanel.java:15)
at gameapp021565320.myPanel.<init>(myPanel.java:36)
at gameapp021565320.myFrame.<init>(myFrame.java:20)
at gameapp021565320.myFrame$6.run(myFrame.java:222)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

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