viewmodel ins wpf gepackt, build failed

DaSaSo.Wpf/ViewModel/Commands/SelectSewerObjectCommand.cs

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+using DaSaSo.Domain.Model;
+using DaSaSo.Wpf.ViewModel.Interface;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.Wpf.ViewModel.Commands
+{
+    public class SelectSewerObjectCommand : AsyncCommandBase
+    {
+        private readonly IActualProject _actualProject;
+        private readonly SewerObjectListViewModel _sewerObjectListViewModel;
+
+        public SelectSewerObjectCommand(IActualProject actualProject, SewerObjectListViewModel sewerObjectListViewModel)
+        {
+            _actualProject = actualProject;
+            _sewerObjectListViewModel = sewerObjectListViewModel;
+        }
+
+        public override async Task ExecuteAsync(object? parameter)
+        {
+            SewerObject? selectedSewer = _sewerObjectListViewModel.GetSelectedSewer();
+            if (selectedSewer == null) return;
+            _actualProject.SetSewerObject(selectedSewer);
+        }
+    }
+}