Telerik.ReportDesigner.Net Error: 0 : System.NullReferenceException: Object reference not set to an instance of an object.
   at Telerik.Reporting.Pdf.PdfAccessibilityElementWriter.TryAttachToParentNode(ProcessingInstanceIdentifier id, PdfOrderedReference element, Int32 rowIndex, Int32 columnIndex)
   at Telerik.Reporting.Pdf.PdfAccessibilityElementWriter.TryAttachToParentNode(IProcessingElement processingElement, IProcessingElement parentProcessingElement, PdfOrderedReference taggedElementReference)
   at Telerik.Reporting.Pdf.PdfAccessibilityElementWriter.AttachNonLeafNode(LayoutElement element, PdfOrderedReference taggedElementReference)
   at Telerik.Reporting.Pdf.PdfAccessibilityElementWriter.AttachNodeToTree(AccessibilityPdfElement pdfElementType, PdfOrderedReference taggedObjectReference)
   at Telerik.Reporting.Pdf.PdfAccessibilityElementWriter.InitTaggedElement(AccessibilityPdfElement pdfElementType)
   at Telerik.Reporting.Pdf.PdfAccessibilityElementWriter.AddParagraphElement(ITableCell element)
   at Telerik.Reporting.Pdf.PdfAccessibilityElementWriter.Visit(HtmlTextBox htmlTextBox)
   at Telerik.Reporting.Processing.HtmlTextBox.Accept(ProcessingElementVisitor visitor)
   at Telerik.Reporting.Processing.ProcessingElementVisitor.Visit(LayoutElement element)
   at Telerik.Reporting.Writing.AccessibilityElementWriter.StartWrite(ReportItemBase element, Int32& index)
   at Telerik.Reporting.Pdf.PdfAccessibilityElementWriter.StartWrite(ReportItemBase element, Int32& index)
   at Telerik.Reporting.Writing.VisualElementWriter`1.StartWriteAccessibilityItem(ReportItemBase item, ElementPageInfo pageInfo, DocumentWriter writer)
   at Telerik.Reporting.Writing.VisualElementWriter`1.WriteClientFocusableItems(T element, ElementPageInfo pageInfo, DocumentWriter writer)
   at Telerik.Reporting.Writing.VisualElementWriter`1.StartWrite(T element, ElementPageInfo pageInfo, DocumentWriter writer)
   at Telerik.Reporting.Writing.ReportItemBaseWriter`1.StartWrite(T element, ElementPageInfo pageInfo, DocumentWriter writer)
   at Telerik.Reporting.Writing.ElementWriter`1.Telerik.Reporting.Writing.IElementWriter.StartWrite(LayoutElement element, ElementPageInfo pageInfo, DocumentWriter writer)
   at Telerik.Reporting.Writing.WriteStartOperationsDispatcher.Write(IElementWriter writer, LayoutElement element, ElementPageInfo pageInfo, DocumentWriter documentWriter)
   at Telerik.Reporting.Writing.WriteOperationsDispatcher.Write(IElementWriter writer, LayoutElement element)
   at Telerik.Reporting.Writing.WriteOperationsDispatcher.Visit(HtmlTextBox htmlTextBox)
   at Telerik.Reporting.Processing.HtmlTextBox.Accept(ProcessingElementVisitor visitor)
   at Telerik.Reporting.Processing.ProcessingElementVisitor.Visit(LayoutElement element)
   at Telerik.Reporting.Writing.WriteOperationsDispatcher.DispatchWriteOperation(LayoutElement element, ElementPageInfo pageInfo)
   at Telerik.Reporting.Writing.DocumentWriter.Telerik.Reporting.BaseRendering.IWriter.WriteStartElement(LayoutElement element, ElementPageInfo pageInfo)
   at Telerik.Reporting.BaseRendering.PageHandler.Telerik.Reporting.Paging.IPageHandler.StartElement(LayoutElement element, ElementPageInfo info)
   at Telerik.Reporting.Paging.PageStartElement.OutputToPage(IPageHandler handler)
   at Telerik.Reporting.Paging.PageElementsLayer.OutputToPage(IPageHandler handler)
   at Telerik.Reporting.Paging.PageContent.Output(IPageHandler handler)
   at Telerik.Reporting.Paging.PageCompositionBase.OutputPageContent(Stopwatch stopwatchOutputContent, PageContent pageContent)
   at Telerik.Reporting.Paging.PageCompositionBase.<>c__DisplayClass124_0.<CreatePageContentOutputTask>b__0()
Telerik.ReportDesigner.Net Error: 0 : An error has occurred while rendering the report: System.OperationCanceledException: The operation was canceled.
   at System.Threading.CancellationToken.ThrowOperationCanceledException()
   at System.Threading.ManualResetEventSlim.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.SpinThenBlockingWait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.InternalWaitCore(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait(CancellationToken cancellationToken)
   at Telerik.Reporting.Paging.PageCompositionBase.SeparateThreadOutputBehavior.Finish()
   at Telerik.Reporting.Paging.PageCompositionBase.CreatePages()
   at Telerik.Reporting.Paging.PagerBase.Telerik.Reporting.Paging.IPager.CreatePages(IPageHandler handler, LayoutElement root)
   at Telerik.Reporting.BaseRendering.RenderingExtensionBase.Render(LayoutElement root, Hashtable renderingContext, Hashtable deviceInfo, CreateStream createStreamCallback, EvaluateHeaderFooterExpressions evalHeaderFooterCallback, PageSettings pageSettings)