viewmodel ins wpf gepackt, build failed

DaSaSo.Wpf/ViewModel/BuildingsiteEditViewModel.cs

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+using DaSaSo.Domain.Model;
+using DaSaSo.Domain.Services;
+using DaSaSo.Domain.Services.BuildingsiteServices;
+using DaSaSo.Wpf.ViewModel.Interface;
+using Microsoft.Toolkit.Mvvm.Input;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Input;
+
+namespace DaSaSo.Wpf.ViewModel
+{
+    public class BuildingsiteEditViewModel : BaseViewModel
+    {
+        private readonly IDataService<Buildingsite> _buildingsiteService;
+        private readonly IActualProject _actualProject;
+        private readonly IRenavigator _renavigator;
+        private readonly Buildingsite _model;
+
+        public Buildingsite Model
+        {
+            get => _model;
+        }
+
+        public string BuildingNumber
+        {
+            get => _model.BuildingSiteNumber;
+            set
+            {
+                if(_model.BuildingSiteNumber != value)
+                {
+                    _model.BuildingSiteNumber = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+        public string Country
+        {
+            get => _model.Country;
+            set
+            {
+                if(_model.Country != value)
+                {
+                    _model.Country = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+        public string Contactperson
+        {
+            get => _model.ContactPerson;
+            set
+            {
+                if (_model.ContactPerson != value)
+                {
+                    _model.ContactPerson = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+
+        public IRelayCommand SaveBuildingsiteCommand { get; set; }
+        public BuildingsiteEditViewModel(IDataService<Buildingsite> buildingsiteService, IActualProject actualProject, IRenavigator renavigator)
+        {
+            _buildingsiteService = buildingsiteService;
+            _actualProject = actualProject;
+            _renavigator = renavigator;
+            _model = actualProject.AktuellBaustelle;
+
+            SaveBuildingsiteCommand = new RelayCommand(SaveBuildingsiteAsync);
+        }
+
+        private async void SaveBuildingsiteAsync()
+        {
+            await _buildingsiteService.Update(Model.Id, Model);
+            _renavigator.Renavigate();
+        }
+    }
+}