java.lang.IllegalArgumentException

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  • Help Adding Months to Gregorian Calendar
    via by k caster,
    • java.lang.IllegalArgumentException: The 'month' argument must be in the range 1 to 12. at org.jfree.date.SpreadsheetDate.<init>(SpreadsheetDate.java:126) at org.jfree.date.SerialDate.createInstance(SerialDate.java:795) at org.jfree.data.time.Day.<init>(Day.java:118) at JFreeChartWYPlot.createDataset(JFreeChartWYPlot.java:333) at JFreeChartWYPlot.init(JFreeChartWYPlot.java:71) at JFreeChartWYPlot.<init>(JFreeChartWYPlot.java:59) at JFreeChartWYPlotApp.main(JFreeChartWYPlotApp.java:10)

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