Unhandled error

Is there somebody to explain me why SWYH crashes as soon as I launch it ? Merci.
crash log file :
Date: 30/11/2017 15:20:49
Message: Élément introuvable. (Exception de HRESULT : 0x80070490)
Detail: System.Runtime.InteropServices.COMException (0x80070490): Élément introuvable. (Exception de HRESULT : 0x80070490)
à System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
à NAudio.CoreAudioApi.MMDeviceEnumerator.GetDefaultAudioEndpoint(DataFlow dataFlow, Role role)
à SWYH.Audio.WasapiProvider…ctor()
à SWYH.App.Application_Startup(Object sender, StartupEventArgs e)
à System.Windows.Application.OnStartup(StartupEventArgs e)
à System.Windows.Application.<.ctor>b__1_0(Object unused)
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.DispatcherOperation.InvokeImpl()
à System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
à System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
à System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
à System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
à MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)
à System.Windows.Threading.DispatcherOperation.Invoke()
à System.Windows.Threading.Dispatcher.ProcessQueue()
à System.Windows.Threading.Dispatcher.WndProcHook(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 SWYH.App.Main()