System.NullReferenceException: Object reference not set to an instance of an object. at Dundas.Charting.WebControl.Ajax.AxisZoomHelper.ProcessMargins(Boolean save) at Dundas.Charting.WebControl.Ajax.ChartZoomEngine.EnterPrintMode() at Dundas.Charting.WebControl.Chart.Save(Stream imageStream) at Dundas.Charting.WebControl.Chart.Render(HtmlTextWriter output) at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) at System.Web.UI.Control.RenderControl(HtmlTextWriter writer) at Dundas.SharePoint.Charting.WebParts.ChartWebPart.Render(HtmlTextWriter output)