viewmodel ins wpf gepackt, build failed

DaSaSo.Wpf/ViewModel/Commands/SaveSewerCommand.cs

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+using DaSaSo.Domain.Model;
+using DaSaSo.Domain.Services;
+using DaSaSo.Domain.Services.SewerObjectService;
+using DaSaSo.Domain.Services.SewerPointServices;
+using DaSaSo.Wpf.ViewModel.Interface;
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.Wpf.ViewModel.Commands
+{
+    public class SaveSewerCommand : AsyncCommandBase
+    {
+
+        private IDataService<SewerObject> _dataService;
+        private IActualProject _actualProject;
+        private readonly ISewerObjectService _sewerObjectService;
+        private readonly IRenavigator _renavigator;
+        private readonly ISewerMainNavigator _navigator;
+
+        public SaveSewerCommand(
+            
+            IDataService<SewerObject> dataService,
+            IActualProject actualProject,
+            ISewerObjectService sewerObjectService,
+            IRenavigator renavigator,
+            ISewerMainNavigator navigator)
+        {
+            
+            _dataService = dataService;
+ 
+            _actualProject = actualProject;
+            _sewerObjectService = sewerObjectService;
+            _renavigator = renavigator;
+            _navigator = navigator;
+            
+            
+        }
+
+
+        public override async Task ExecuteAsync(object? parameter)
+        {
+            Trace.WriteLine(_actualProject.AktuellSewerObject.IsChanged);
+            _navigator.CurrentViewModel = null;
+            _renavigator.Renavigate();
+        }
+    }
+}