Error message: Column named ActionImportance cannot be found

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VB

I want to change gridview cell background.

I want to change using different three color, depending on cell data text.

if text of gridview cell is "High", I want to set red color, or

if text of gridveiw cell is "Moderate", I want to set yellow color. or

if text is "Low", I want to set Green color.

I binded gridview with Access datasource.

here is my code:

Private Sub DataGridView1_CellFormatting(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellFormattingEventArgs) Handles ActionsLogDataGridView.CellFormatting

    For j = 0 To Me.ActionsLogDataGridView.RowCount - 1
        Dim Cell = Me.ActionsLogDataGridView.Rows(j).Cells.Item("ActionImportance")
        Dim col As Color

        Select Case Cell.Value.ToString
            Case "Low"
                col = Color.Green
            Case "Moderate"
                col = Color.Yellow
            Case "high"
                col = Color.Red
        End Select

        Cell.Style.BackColor = col
    Next
End Sub

thanks...