dgandgan - 2007-04-18

Hi,
I'm running Ubuntu Edgy (6.10) and get the following when I run start-nettool.sh.
I have JDK 5 installed.
Apr 18, 2007 11:44:39 AM net.neilja.nettool.main.ui.MainController <init>
WARNING: Unable to set Look & Feel class: com.jgoodies.looks.plastic.PlasticXPLookAndFeel
Reverting to default Look & Feel class: com.jgoodies.looks.plastic.PlasticXPLookAndFeel
Apr 18, 2007 11:44:39 AM net.neilja.nettool.main.ui.MainController <init>
WARNING: Unable to set default Look & Feel class: com.jgoodies.looks.plastic.PlasticXPLookAndFeel
Apr 18, 2007 11:44:39 AM net.neilja.swing.Icons loadNamedIcon
WARNING: Unable to load icon: /org.eclipse.debug.ui/icons/full/obj16/rundebug.gif
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
        at net.neilja.nettool.main.ui.MainView.<init>(MainView.java:51)
        at net.neilja.nettool.main.ui.MainController.<init>(MainController.java:136)
        at net.neilja.nettool.main.ui.MainController.start(MainController.java:86)
        at net.neilja.nettool.main.ui.MainController$10.run(MainController.java:542)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

Does anyone have any idea what could be the reason ?
Thanks in advance.