Export report problem

I'm trying to export a report to an excel file so that I can perhaps import it into a database to graph and track over time, but when I try to export it I get an error, which when clicked on for details gives me... (copied with the Copy button of the error window.)

DataDynamics.Reports.ReportsException: An unexpected error occured. Additional information: 'Object reference not set to an instance of an object.' ---> System.NullReferenceException: Object reference not set to an instance of an object.

   at #Z4g.#R2f.#x0d(Boolean fillFromBottom)

   at #rUg.#qUg.#x0d(#LUg context, Boolean fillFromBottom)

   at #GUg.#TUg.#n7g(ITableCellCollection tableCells, #qUg componentRenderingArea)

   at #GUg.#TUg.#l7g(ITableRowCollection tableRows, #qUg componentRenderingArea)

   at #GUg.#TUg.#r7g(#LUg context, ITableGroup groupInstance, #qUg componentRenderingArea)

   at #GUg.#TUg.#o7g(#LUg context, ITableGroupCollection groups, ITable table, #qUg componentRenderingArea)

   at #GUg.#TUg.Render(#LUg context, #qUg componentRenderingArea, IReportItem reportItem)

   at #GUg.#LUg.#S6g(IReportItem reportItem, #qUg componentRenderingArea)

   at #GUg.#RUg.Render(#LUg context, #qUg componentRenderingArea, IReportItem reportItem)

   at #GUg.#LUg.#S6g(IReportItem reportItem, #qUg componentRenderingArea)

   at DataDynamics.Reports.Rendering.Excel.ExcelTransformationDevice.#pvh(IReport report, Stream template, StreamProvider streamProvider, #x5g settings)

   at DataDynamics.Reports.Rendering.Excel.ExcelTransformationDevice.Render(IReport report, StreamProvider streams, NameValueCollection settings)

   at DataDynamics.Reports.ReportRuntime.Render(IRenderingExtension renderingExtension, StreamProvider streams, NameValueCollection settings, Boolean forceDataRefresh, Boolean forceParameterDataRefresh)

   --- End of inner exception stack trace ---

   at DataDynamics.Reports.ReportRuntime.Render(IRenderingExtension renderingExtension, StreamProvider streams, NameValueCollection settings, Boolean forceDataRefresh, Boolean forceParameterDataRefresh)

   at DataDynamics.Reports.ReportRuntime.Render(IRenderingExtension renderingExtension, StreamProvider streams, NameValueCollection settings)

   at DataDynamics.Reports.Windows.Forms.ReportPreviewToolBar.Export(RenderingExtensionInfo renderingInfo)

   at DataDynamics.Reports.Windows.Forms.ReportPreviewToolBar.#OVf(Object sender, EventArgs e)

   at DataDynamics.Reports.Windows.Forms.CommandBars.CommandBarControl.OnClick(EventArgs e)

   at DataDynamics.Reports.Windows.Forms.CommandBars.CommandBarControl.PerformClick(EventArgs e)

   at DataDynamics.Reports.Windows.Forms.CommandBars.CommandBarContextMenu.MenuBarItem.OnClick(EventArgs e)

   at System.Windows.Forms.MenuItem.MenuItemData.Execute()

   at System.Windows.Forms.Command.Invoke()

   at System.Windows.Forms.Command.DispatchID(Int32 id)

   at System.Windows.Forms.Control.WmCommand(Message& m)

   at System.Windows.Forms.Control.WndProc(Message& m)

   at DataDynamics.Reports.Windows.Forms.CommandBars.CommandBar.WndProc(Message& message)

   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)

   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)

   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)