RDLC Export to PDF throws Object reference not set to an object error

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URL-->(http://localhost:13034/EMD.RIS/Reserved.ReportViewerWebControl.axd?Culture=1033&CultureOverrides=False&UICulture=127&UICultureOverrides=False&ReportStack=1&ControlID=0b9cd13c56b94cc6a8969464b4a96bd4&Mode=true&OpType=Export&FileName=&ContentDisposition=OnlyHtmlInline&Format=PDF), Message: Object reference not set to an instance of an object. - at Microsoft.ReportingServices.OnDemandReportRendering.OnDemandPageEvaluation.Add(String textboxName, Object textboxValue) at Microsoft.ReportingServices.OnDemandReportRendering.Report.AddToCurrentPage(String textboxDefinitionName, Object textboxInstanceOriginalValue) at Microsoft.ReportingServices.Rendering.HPBProcessing.HiddenPageItem.RegisterTextBoxes(RPLWriter rplWriter, PageContext pageContext) at Microsoft.ReportingServices.Rendering.HPBProcessing.PageItem.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState) at Microsoft.ReportingServices.Rendering.HPBProcessing.PageItemContainer.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState) at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.RowInfo.AddToPageContent(ScalableList`1 columnInfo, Int32& colsOnPage, Boolean isLTR, Boolean pinnedToParentCell, RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState) at Microsoft.ReportingServices.Rendering.HPBProcessing.Tablix.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState) at Microsoft.ReportingServices.Rendering.HPBProcessing.PageItemContainer.AddToPage(RPLWriter rplWriter, PageContext pageContext, Double pageLeft, Double pageTop, Double pageRight, Double pageBottom, RepeatState repeatState) at Microsoft.ReportingServices.Rendering.HPBProcessing.Report.NextPage(RPLWriter rplWriter, Int32 page, Int32 totalPages) at Microsoft.ReportingServices.Rendering.HPBProcessing.HPBProcessing.GetNextPage(RPLReport& rplReport) at Microsoft.ReportingServices.Rendering.ImageRenderer.PDFRenderer.Render(Report report, NameValueCollection deviceInfo, Hashtable renderProperties, CreateAndRegisterStream createAndRegisterStream) at Microsoft.ReportingServices.Rendering.ImageRenderer.RendererBase.Render(Report report, NameValueCollection reportServerParameters, NameValueCollection deviceInfo, NameValueCollection clientCapabilities, Hashtable& renderProperties, CreateAndRegisterStream createAndRegisterStream)