viewmodel ins wpf gepackt, build failed

DaSaSo.Wpf/ViewModel/Commands/AddBuildingsiteCommand.cs

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+using DaSaSo.Domain.Model;
+using DaSaSo.Domain.Services;
+using DaSaSo.Domain.Services.BuildingsiteServices;
+using DaSaSo.Wpf.ViewModel.Interface;
+using System.Threading.Tasks;
+
+namespace DaSaSo.Wpf.ViewModel.Commands
+{
+    public class AddBuildingsiteCommand: AsyncCommandBase
+    {
+        private IActualProject _actualProject;
+        private IBuildingsiteService _buildingsiteService;
+        private readonly IRenavigator _renavigator;
+        private readonly IDataService<Buildingsite> _dataservice;
+        public AddBuildingsiteCommand(IDataService<Buildingsite> dataService, IActualProject actualProject, IBuildingsiteService buildingsiteService, IRenavigator renavigator)
+        {
+            _actualProject = actualProject;
+            _buildingsiteService = buildingsiteService;
+            _dataservice = dataService;
+            _renavigator = renavigator;
+        }
+
+        public override async Task ExecuteAsync(object? parameter)
+        {
+            Buildingsite buildingsite = await _buildingsiteService.CreateBuildingsite(_actualProject.AktuellProjekt);
+            _actualProject.SetBuildingSite(buildingsite);
+            _renavigator.Renavigate();
+        }
+    }
+}