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

[Daniel Kraus]

Exception:

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 450
   at XLToolbox.WorkbookStorage.Store.Dispose(Boolean disposing) in XLToolbox\WorkbookStorage\Store.cs:line 227
   at XLToolbox.WorkbookStorage.Store.Dispose() in XLToolbox\WorkbookStorage\Store.cs:line 215
   at XLToolbox.Export.ViewModels.SettingsViewModelBase.SaveExportPath() in XLToolbox\Export\ViewModels\SettingsViewModelBase.cs:line 231
   at XLToolbox.Export.ViewModels.BatchExportSettingsViewModel.DoExport() in XLToolbox\Export\ViewModels\BatchExportSettingsViewModel.cs:line 367
   at XLToolbox.Export.ViewModels.BatchExportSettingsViewModel.ConfirmFolder(FileNameMessageContent messageContent) in XLToolbox\Export\ViewModels\BatchExportSettingsViewModel.cs:line 694
   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() in x:\Code\bovender\Bovender\Mvvm\Messaging\Message.cs:line 63
   at Bovender.Mvvm.Actions.FileFolderActionBase.Invoke(Object parameter) in x:\Code\bovender\Bovender\Mvvm\Actions\FileFolderActionBase.cs:line 84
   at System.Windows.Interactivity.TriggerAction.CallInvoke(Object parameter)
   at System.Windows.Interactivity.TriggerBase.InvokeActions(Object parameter)
   at System.Windows.Interactivity.EventTriggerBase.OnEvent(EventArgs eventArgs)
   at System.Windows.Interactivity.EventTriggerBase.OnEventImpl(Object sender, EventArgs eventArgs)
   at Bovender.Mvvm.Messaging.Message`1.Send(T messageContent, Action`1 respond) in x:\Code\bovender\Bovender\Mvvm\Messaging\Message.cs:line 58
   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) in x:\Code\bovender\Bovender\Mvvm\DelegatingCommand.cs:line 121

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

User comment on submission:

Performing batch export.