viewmodel ins wpf gepackt, build failed

DaSaSo.Wpf/ViewModel/ClientEditViewModel.cs

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+using DaSaSo.Domain.Model;
+using DaSaSo.Domain.Services;
+using DaSaSo.Wpf.ViewModel.Interface;
+using Microsoft.Toolkit.Mvvm.Input;
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.Wpf.ViewModel
+{
+    public class ClientEditViewModel : BaseViewModel
+    {
+        private Client _model;
+        private readonly IDataService<Client> _dataService;
+        private readonly IActualProject _actualProject;
+        private readonly IRenavigator renavigator;
+
+        public Client Model { get => _model; set => _model = value; }
+
+        public IRelayCommand SaveClientCommand { get; set; }
+
+
+        public ClientEditViewModel(IDataService<Client> dataService, IActualProject actualProject, IRenavigator renavigator)
+        {
+            this._dataService = dataService;
+            SaveClientCommand = new RelayCommand(SaveClient);
+            _actualProject = actualProject;
+            this.renavigator = renavigator;
+            this._model = _actualProject.AktuellClient;
+        }
+
+        private async void SaveClient()
+        {
+            await _dataService.Update(Model.Id, Model);
+            renavigator.Renavigate();
+        }
+    }
+}