Dynamically adding ColumnSeries, Unhandled Exception thrown in all browsers

I am binding a DataTable dynamically in code behind to a RadHtmlChart and adding ColumnSeries Objects to the PlotArea.  The code I'm executing looks like this:

SqlDataAdapter da = new SqlDataAdapter(sqlCommand);
                    da.Fill(pivotTable);

                    for (int i = 2; i < pivotTable.Columns.Count; i++ )
                    {
                        ColumnSeries cs = new ColumnSeries();
                        cs.DataFieldY = pivotTable.Columns[i].ColumnName;
                        cs.Name = pivotTable.Columns[i].ColumnName;
                        cs.Gap = 1.5;
                        cs.Spacing = 0.4;
                        cs.Stacked = true;
                        cs.LabelsAppearance.Position = Telerik.Web.UI.HtmlChart.BarColumnLabelsPosition.Center;
                        cs.TooltipsAppearance.Color = System.Drawing.Color.White;

                        GraphAvgWT.PlotArea.Series.Add(cs);
                    }

                    GraphAvgWT.DataSource = pivotTable;
                    GraphAvgWT.DataBind();

When I run this in any browser there is an exception thrown that looks like this:

Unhandled exception at line 869, column 1 in http://localhost:49573/ScriptResource.axd?d=WLmYcdOKb_LAUnVSHQHR_hSJ5_ioMpFtRv-OH10MfF6U9fb1aA_Wxx1ydL_Dzi9j6TRzmqrWagcWnKdo5Eq1K82yemCb8VeXhI_pB8YUERcZ9lmHzOgkSZqZJb4-cBN_QxRKGZb-mZqVdCLfssHYSg2&t=5ebf97e0

0x800a03ee - JavaScript runtime error: Expected ')'

As a result the chart does not contain any data, but the Legend shows all of the columns/series that I added.  I've also compared this code to the GroupDataSource example (http://www.telerik.com/support/code-library/group-radhtmlchart-data-source) and I'm adding the series by a similar manner and setting the same properties on the ColumnSeries Object.   

If I comment-out the line that reads "GraphAvgWT.PlotArea.Series.Add(cs);" the error goes away, but of course, there is no data in the chart.

Can you please help me resolve this issue?  Thanks.