System.Reflection.TargetInvocationException: Obiekt docelowy wywołania zgłosił wyjątek. ---> System.ArgumentNullException: Wartość nie może być zerowa.
Nazwa parametru: element
   w MS.Internal.Media.VisualTreeUtils.AsNonNullVisual(DependencyObject element, Visual& visual, Visual3D& visual3D)
   w System.Windows.Media.VisualTreeHelper.GetParent(DependencyObject reference)
   w Octgn.Play.Gui.ArrowAdorner.UpdateToPoint(Object sender, EventArgs e)
   w MS.Internal.ComponentModel.PropertyChangeTracker.OnPropertyInvalidation(DependencyObject d, DependencyPropertyChangedEventArgs args)
   w System.Windows.DependentList.InvalidateDependents(DependencyObject source, DependencyPropertyChangedEventArgs sourceArgs)
   w System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
   w System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, OperationType operationType)
   w System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, OperationType operationType, Boolean isInternal)
   w System.Windows.DependencyObject.SetValue(DependencyPropertyKey key, Object value)
   w Octgn.Play.Gui.CardControl.set_IsInverted(Boolean value)
   w Octgn.Play.Gui.CardControl.UpdateInvertedTransform()
   w Octgn.Play.Gui.CardControl.PropertyChangeHandler(Object sender, PropertyChangedEventArgs e)
   w System.ComponentModel.PropertyChangedEventHandler.Invoke(Object sender, PropertyChangedEventArgs e)
   w Octgn.Play.Card.OnPropertyChanged(String property)
   w Octgn.Play.Card.set_Y(Double value)
   w Octgn.Play.Actions.MoveCard.Do()
   w Octgn.Networking.Handler.MoveCardAt(Player player, Card card, Int32 x, Int32 y, Int32 idx, Boolean faceUp)
   w Octgn.Networking.BinaryParser.Parse(Byte[] data)
   w Octgn.Networking.Handler.ReceiveMessage(Byte[] data)
   --- Koniec śladu stosu wyjątków wewnętrznych ---
   w System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)
   w System.RuntimeMethodHandle.InvokeMethodFast(Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)
   w System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
   w System.Delegate.DynamicInvokeImpl(Object[] args)
   w System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)
   w System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
   w System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
   w System.Windows.Threading.DispatcherOperation.InvokeImpl()
   w System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
   w System.Threading.ExecutionContext.runTryCode(Object userData)
   w System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
   w System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   w System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   w System.Windows.Threading.DispatcherOperation.Invoke()
   w System.Windows.Threading.Dispatcher.ProcessQueue()
   w System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   w MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   w MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   w System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)
   w System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
   w System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
   w System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Boolean isSingleParameter)
   w System.Windows.Threading.Dispatcher.Invoke(DispatcherPriority priority, Delegate method, Object arg)
   w MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   w MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
   w System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   w System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
   w System.Windows.Threading.Dispatcher.Run()
   w System.Windows.Application.RunDispatcher(Object ignore)
   w System.Windows.Application.RunInternal(Window window)
   w System.Windows.Application.Run(Window window)
   w System.Windows.Application.Run()
   w Octgn.OctgnApp.Main()