an item with the same key is already added

System.ArgumentException: An item with the same key has already been added.
   at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
   at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
   at Knx.Ets.TelegramRecorder.DptEngine..ctor(DatapointTypeCollection datapointTypeCollection)
   at Knx.Ets.TelegramRecorderView.ViewModel.MonitorViewModelBase..ctor(ILog log, MonitorGridSettings gridSettings, IWorkplaceViewModel workplaceViewModel, IDatapointTypeService datapointTypeService, IMessageBoxService messageBoxService, ITabbedDialogService dialogService, IMainWindowService windowService, IMonitorOptions monitorOptions, IHtmlWindowService htmlWindowService, IDispatcher dispatcher, KnxMasterData knxMaster, ISelectionService selectionService, Func`3 telegramRecorderFactory, IDragDropHandler dragDropHandler, IFindAndReplaceService findAndReplaceService, IPropertyChangedService propertyChangedService, IContextMenuViewModel contextMenuViewModel, Func`3 disclaimerFactory, IKnxSupportLinks supportLinks, MonitorMode monitorMode, Project project)
   at Knx.Ets.TelegramRecorderView.ViewModel.GroupMonitorViewModel..ctor(ILog log, MonitorGridSettings gridSettings, IWorkplaceViewModel workplaceViewModel, IDatapointTypeService datapointTypeService, IMessageBoxService messageBoxService, ITabbedDialogService dialogService, IMainWindowService windowService, IMonitorOptions monitorOptions, IHtmlWindowService htmlWindowService, IDispatcher dispatcher, KnxMasterData knxMaster, ISelectionService selectionService, Func`3 telegramRecorderFactory, IDragDropHandler dragDropHandler, IFindAndReplaceService findAndReplaceService, IPropertyChangedService propertyChangedService, IContextMenuViewModel contextMenuViewModel, Func`3 disclaimerFactory, IKnxSupportLinks supportLinks, Project project)
   at lambda_method(Closure , Object[] )
   at Autofac.Core.Activators.Reflection.BoundConstructor.Instantiate()