viewmodel ins wpf gepackt, build failed

DaSaSo.Wpf/ViewModel/SewerDamageListViewModel.cs

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+using DaSaSo.Domain.Model;
+using DaSaSo.Domain.Services;
+using DaSaSo.Wpf.ViewModel.Commands;
+using DaSaSo.Wpf.ViewModel.Interface;
+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 SewerDamageListViewModel : BaseViewModel
+    {
+        private readonly IActualProject _actualProject;
+        private readonly IDataService<SewerObject> _dataService;
+        private SewerDamage? _selectedDamage;
+
+        public ICommand AddNewDamage { get; set; }
+        public SewerDamage SelectedDamage
+        {
+            get => _selectedDamage;
+            set
+            {
+                _selectedDamage = value;
+                _actualProject.SetSewerDamage(_selectedDamage);
+                OnPropertyChanged();
+            }
+        }
+
+        SewerObject _model;
+        public List<SewerDamage> Damages { get => _model.SewerDamages.ToList(); }
+        
+        public SewerDamageListViewModel(IActualProject actualProject, IDataService<SewerObject> dataService, IRenavigator addedNavigator)
+        {
+            _actualProject = actualProject;
+            _dataService = dataService;
+            _model = _actualProject.AktuellSewerObject;
+            AddNewDamage = new AddDamageCommand(actualProject,addedNavigator);
+        }
+
+    }
+}