Hi I am K.Manoj Kashyap i run this(bar chart) application in Eclipse(3.2) but i did't get please let me know why.?

Exception in thread "main" java.lang.Error: Unresolved compilation problems:
DefaultCategoryDataset cannot be resolved to a type
DefaultCategoryDataset cannot be resolved to a type
JFreeChart cannot be resolved to a type
ChartFactory cannot be resolved
PlotOrientation cannot be resolved
CategoryPlot cannot be resolved to a type
ChartFrame cannot be resolved to a type
ChartFrame cannot be resolved to a type
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