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[protege-discussion] Error when activating plugin

Adrianus Kresna adrianuskresna at
Sat Dec 29 21:20:31 PST 2007

I'm new at protege and I was trying to learn about plugin development. So I downloaded the example plugins given, compile them and such, and put them in the plugin directory. When I activated protege, the plugin name appeared in the plugin list but when I checked the tab, there's an error message as such:
Exception in thread "AWT-EventQueu-0" java.lang.NoClassDefFoundError: examples/tabwdget/FrameCounter$1
at examples.tabwidget.FrameCounter.initialize(
at edu.stanford.smi.protege.widget.WidgetUtilities.createTabWidget(Unknown Source)
and it goes on...
can someone help me to explain what went wrong?
Thank you.
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