I installed DC+SB and tried to bind a few sounds, worked great. Closed then reopened the program and since i get this message :
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System.NullReferenceException: La référence d'objet n'est pas définie à une instance d'un objet.
à DC_SB.MainWindow.AddSound_Click(Object sender, RoutedEventArgs e) dans D:\Jany\Praca\DCSB\DC+SB\Windows\MainWindow.xaml.cs:ligne 123
à System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
à System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
à System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
à System.Windows.UIElement.RaiseEvent(RoutedEventArgs e)
à System.Windows.Controls.Primitives.ButtonBase.OnClick()
à System.Windows.Controls.Button.OnClick()
à System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
à System.Windows.UIElement.OnMouseLeftButtonUpThunk(Object sender, MouseButtonEventArgs e)
à System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
à System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
à System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
à System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
à System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)
à System.Windows.UIElement.OnMouseUpThunk(Object sender, MouseButtonEventArgs e)
à System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
à System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
à System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
à System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
à System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
à System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
à System.Windows.Input.InputManager.ProcessStagingArea()
à System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
à System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
à System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
à System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
à System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
à MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
à MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
à System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
à System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
à System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
à MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
à MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
à System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
à System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
à System.Windows.Application.RunDispatcher(Object ignore)
à System.Windows.Application.RunInternal(Window window)
à System.Windows.Application.Run(Window window)
à System.Windows.Application.Run()
à DC_SB.App.Main() dans D:\Jany\Praca\DCSB\DC+SB\obj\Release\App.g.cs:ligne 0
Your help would be greatly appreciated.

Hi, does this message appear right after you open the program or when you try to add sound?