在做图表时遇到一些问题，望高手能帮助解答

问题在图片中

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Dim Chart As WinForm.Chart \'定义一个图表变量
Dim Series As WinForm.ChartSeries \'定义一个图系变量
Dim t As Table = Tables("统计表1") \'定义一个变量t引用数据表
Chart = Forms("窗口2").Controls("Chart1") \' 引用窗口中的图表
Chart.ChartType = ChartTypeEnum.Bar \'图表类型改为Bar(条形)
Chart.SeriesList.Clear() \'清除图表原来的图系
For Each c As Col In t.Cols
    If c.Name <> "年" Then
        Series = Chart.SeriesList.Add() \'增加一个图系
        Series.Text = c.caption \'设置图系的标题
        Series.Length = t.Rows.Count \'设置图系的长度
        For r As Integer = 0 To t.Rows.Count - 1
            Series.X(r) = r
            Series.Y(r) = t.Rows(r)(c.Name)
Series.DataLabelText = "{#YVAL}"

        Next
    End If
Next
For r As Integer = 0 To t.Rows.Count - 1
   Chart.AxisX.SetValueLabel(r, t.Rows(r)("年")) \'指定字符表示
Next
Chart.AxisX.AnnoWithLabels = True \'启用字符标示
Chart.VisualEffect = True \'加上这一行,让你的图表更漂亮
Chart.LegendVisible = True \'显示图列
Chart.LegendCompass= CompassEnum.South \'图列显示在南方(底端)