NullReferenceException: 並未將物件參考設定為物件的執行個體。
StackTrace:
   於 Quicker.App.<>c__DisplayClass27_0.uMx8ek1iUti()
   於 System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   於 System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   於 System.Windows.Threading.DispatcherOperation.InvokeImpl()
   於 MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj)
   於 System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)