Printing a blank pivot chart?

I have written this in my code.
/// Adding a PivotTable to the worksheet
int index = worksheet.PivotTables.Add("=Test!A2:F33", “A37”, “pivottable1”);

///Accessing the instance of the newly added PivotTable

PivotTable pivottable = worksheet.PivotTables[index];

pivottable .RowGrand = true;

pivottable .ColumnGrand = true;
pivottable.IsAutoFormat = true;
pivottable.AddFieldToArea(PivotFieldType.Row, 0);
///pivottable.AddFieldToArea(PivotFieldType.Column, 2);
pivottable.AddFieldToArea(PivotFieldType.Data, 1);

//Adding a column chart
int index1 = worksheet.Charts.Add(ChartType.Column, 44, 5, 72, 16);
worksheet.Charts[index1].PivotSource = “pivottable1!pivottable”;
worksheet.Charts[index1].HidePivotFieldButtons = false;


It’s printing a blank chart.
Attaching the excel file.
What’s the problem??

The problem was here

worksheet.Charts[index1].PivotSource = “Test!PivotTable1”;
Test was the name of my sheet in the spreadsheet…

Problem solved