viewmodel ins wpf gepackt, build failed

DaSaSo.Wpf/ViewModel/Commands/AddSewerObjectCommand.cs

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+using DaSaSo.Domain.Model;
+using DaSaSo.Domain.Services.SewerObjectService;
+using DaSaSo.Wpf.ViewModel.Interface;
+using System.Threading.Tasks;
+
+namespace DaSaSo.Wpf.ViewModel.Commands
+{
+    public class AddSewerObjectCommand : AsyncCommandBase
+    {
+        private IActualProject _actualProject;
+        private ISewerObjectService _sewerObjectService;
+
+        public AddSewerObjectCommand(IActualProject actualProject, ISewerObjectService sewerObjectService)
+        {
+            _actualProject = actualProject;
+            _sewerObjectService = sewerObjectService;
+        }
+
+        public override async Task ExecuteAsync(object? parameter)
+        {
+            SewerObject sewerobject = await _sewerObjectService.CreateSewerObject(_actualProject.AktuellBaustelle);
+            _actualProject.SetSewerObject(sewerobject);
+        }
+    }
+}