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Null Pointer Exception in NN but not in IE???!!!!

 
Judy Abott
Greenhorn
Posts: 6
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hi all,
i have worked on a an applet that uses a nother Runnable class to implement an animated progress bar using MediaTracker, and i can control when to start animation and when to stop it! it worked great on IE. But when i came to test it on Netscape Navigator, it surprised me with THIS
and now i don't know what to do!! can anybody give me a hint
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# Applet exception: java.lang.NullPointerException
java.lang.NullPointerException
at sun.awt.windows.WGraphics.drawImage(Compiled Code)
* at AnimationPanel.flip(Compiled Code)
at AnimationPanel.run(Compiled Code)
at java.lang.Thread.run(Compiled Code)
java.io.IOException: CreateProcess: vcafe -netscape error=2
at java.lang.Win32Process.<init>(Compiled Code)
at java.lang.Runtime.exec(Compiled Code)
* at java.lang.Runtime.exec(Compiled Code)
at netscape.debug.Debugger.launchDebugger(Compiled Code)
at netscape.debug.Debugger.uncaughtException(Compiled Code)
at netscape.applet.AppletThreadGroup.uncaughtException(Compiled Code
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