主题：提示找不到某列，怎么解决啊

提示找不到某列，怎么解决啊

下面红色部分代码 运行提示找不到年列

在卷宗入库中，有一个录入时间字段，是想根据录入时间字段值来判断年如果等于 &year 或者月等于& Month  结果我怎么改都没有改成功？求解啊

'首先生成统计表
Dim dt As DataTable
Dim b As New GroupTableBuilder("统计表1",DataTables("卷宗入库"))
b.Groups.AddDef("录入时间",DateGroupEnum.Year,"年")
b.Groups.AddDef("录入时间",DateGroupEnum.Month,"月")
b.Groups.AddDef("承办人")
b.Totals.AddDef("承办人",AggregateEnum.Count,"卷宗编号") '根据客户列来统计记录数,也就是卷宗编号
dt = b.Build(True) '参数设置为True,生成一个临时表,不在主界面显示
'然后根据统计表生成目录树
Dim trv As WinForm.TreeView = e.Form.Controls("TreeView1")
trv.BuildTree(dt, "年|月|承办人")
trv.StopRedraw
For Each nd As WinForm.TreeNode In trv.AllNodes
    Dim Year As Integer = nd.DataRow("年")
    Dim Month As Integer = nd.DataRow("月")
    Dim Product As String = nd.DataRow("承办人")
    Select Case nd.Level
        Case 0
            nd.Text = nd.text & "年(" & dt.Compute("Sum(卷宗编号)","年 = " & Year) & "卷"  & DataTables("卷宗入库").Compute("Sum(卷宗册数)","年= " & Year) & "册)"
        Case 1
            nd.Text = nd.text & "月(" & dt.Compute("Sum(卷宗编号)","年 = " & Year & " And 月 = " & Month) & "卷" & DataTables("卷宗入库").Compute("Sum(卷宗册数)","年 = " & Year & " And 月 = " & Month) & "册)"
        Case 2
            nd.Text = nd.text & "(" & nd.DataRow("卷宗编号") & "卷" & DataTables("卷宗入库").Compute("Sum(卷宗册数)") & "册)"
    End Select
Next
trv.Nodes.Insert("显示所有行","显示所有行(" & dt.Compute("Sum(卷宗编号)") & "卷" & DataTables("卷宗入库").Compute("Sum(卷宗册数)") & "册)",0)
trv.ResumeRedraw