viewmodel ins wpf gepackt, build failed

DaSaSo.Wpf/ViewModel/State/Navigation/MainWindowNavigator.cs

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+using DaSaSo.Wpf.ViewModel.Commands;
+using DaSaSo.Wpf.ViewModel.Interface;
+using System;
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+using System.Windows.Input;
+
+namespace DaSaSo.Wpf.ViewModel.State.Navigation
+{
+    public class MainWindowNavigator : ObservableObject, IMainWindowNavigator
+    {
+        
+        private BaseViewModel _currentViewModel;
+        public BaseViewModel CurrentViewModel
+        {
+            get => _currentViewModel;
+            set
+            {
+                _currentViewModel?.Dispose();
+                _currentViewModel = value;
+                StateChanged?.Invoke();
+            }
+        }
+        public event Action StateChanged;
+    }
+}

DaSaSo.Wpf/ViewModel/State/Navigation/SewerMainNavigator.cs

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+using DaSaSo.Wpf.ViewModel.Interface;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.Wpf.ViewModel.State.Navigation
+{
+    public class SewerMainNavigator : ISewerMainNavigator
+    {
+        private BaseViewModel _currentViewModel;
+        public BaseViewModel CurrentViewModel
+        {
+            get => _currentViewModel;
+            set
+            {
+                _currentViewModel?.Dispose();
+                _currentViewModel = value;
+                StateChanged?.Invoke();
+            }
+        }
+        public event Action StateChanged;
+    }
+}

DaSaSo.Wpf/ViewModel/State/Navigation/ViewModelDelegateRenavigator.cs

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+using DaSaSo.Wpf.ViewModel.Interface;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.Wpf.ViewModel.State.Navigation
+{
+    public class ViewModelDelegateRenavigator<TViewModel> : IRenavigator where TViewModel: BaseViewModel
+    {
+        private readonly IMainWindowNavigator _navigator;
+        private readonly CreateViewModel<TViewModel> _createViewModel;
+
+        public ViewModelDelegateRenavigator(IMainWindowNavigator navigator, CreateViewModel<TViewModel> createViewModel)
+        {
+            _navigator = navigator;
+            _createViewModel = createViewModel;
+        }
+
+        public void Renavigate()
+        {
+            _navigator.CurrentViewModel = _createViewModel();
+        }
+    }
+}