#64 Object reference not set to an instance of an object.

[Daniel Kraus]

Exception:

:::c#
System.NullReferenceException: Object reference not set to an instance of an object.
   at XLToolbox.WorkbookStorage.Item.WriteToSheet(Worksheet sheet, Int32 row) in XLToolbox\WorkbookStorage\Item.cs:line 64
   at XLToolbox.WorkbookStorage.Store.WriteToWorksheet() in XLToolbox\WorkbookStorage\Store.cs:line 445
   at XLToolbox.WorkbookStorage.Store.Dispose(Boolean disposing) in XLToolbox\WorkbookStorage\Store.cs:line 226
   at XLToolbox.WorkbookStorage.Store.Dispose() in XLToolbox\WorkbookStorage\Store.cs:line 214
   at XLToolbox.Export.Models.BatchExportSettings.Store(Workbook workbookContext) in XLToolbox\Export\Models\BatchExportSettings.cs:line 112
   at XLToolbox.Export.ViewModels.BatchExportSettingsViewModel.DoExport() in XLToolbox\Export\ViewModels\BatchExportSettingsViewModel.cs:line 363
   at XLToolbox.Export.ViewModels.BatchExportSettingsViewModel.ConfirmFolder(FileNameMessageContent messageContent) in XLToolbox\Export\ViewModels\BatchExportSettingsViewModel.cs:line 705
   at XLToolbox.Export.ViewModels.BatchExportSettingsViewModel.<DoChooseFolder>b__4(FileNameMessageContent content) in XLToolbox\Export\ViewModels\BatchExportSettingsViewModel.cs:line 352
   at Bovender.Mvvm.Messaging.Message`1.<>c__DisplayClass2.<Send>b__0()
   at Bovender.Mvvm.Actions.FileFolderActionBase.Invoke(Object parameter)
   at System.Windows.Interactivity.TriggerBase.InvokeActions(Object parameter)
   at Bovender.Mvvm.Actions.NonUiTrigger.Invoke(Object parameter)
   at Bovender.Mvvm.Actions.MessageActionExtensions.Invoke(MessageActionBase action, Object parameter)
   at XLToolbox.Export.QuickExporter.ChooseFolderMessage_Sent(Object sender, MessageArgs`1 e) in XLToolbox\Export\QuickExporter.cs:line 106
   at Bovender.Mvvm.Messaging.Message`1.Send(T messageContent, Action`1 respond)
   at XLToolbox.Export.ViewModels.BatchExportSettingsViewModel.DoChooseFolder() in XLToolbox\Export\ViewModels\BatchExportSettingsViewModel.cs:line 350
   at XLToolbox.Export.ViewModels.BatchExportSettingsViewModel.<get_ChooseFolderCommand>b__0(Object param) in XLToolbox\Export\ViewModels\BatchExportSettingsViewModel.cs:line 276
   at Bovender.Mvvm.DelegatingCommand.Execute(Object parameter)

Message: Object reference not set to an instance of an object.