Swing demo example

Hi, everyone.

I installed JChart(0.7.5) for the first time, today.
And tried to compile and execute SwingDemo example.
I succeeded in compile, but I executed it, 
Exception was happened.

Exception in thread "main" java.lang.NoClassDefFoundError:
org/jCharts/chartData/interfaces/IPieChartDataSet

I set classpath to jCharts-0.7.5.jar.

How do I execute the example?

Can anyone help me.
Thanks,



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