viewmodel ins wpf gepackt, build failed

DaSaSo.Wpf/ViewModel/Interface/IActualProject.cs

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+using DaSaSo.Domain.Model;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.Wpf.ViewModel.Interface
+{
+    public interface IActualProject
+    {
+        event EventHandler? ClientChanged;
+        event EventHandler? ProjectChanged;
+        event EventHandler? BuildingSiteChanged;
+        event EventHandler? SewerObjectChanged;
+        event EventHandler? SewerDamageChanged;
+        Client AktuellClient { get; }
+        Project AktuellProjekt { get; }
+        Buildingsite AktuellBaustelle { get; }
+        SewerObject AktuellSewerObject { get; }
+        SewerDamage AktuellSewerDamage { get; }
+        Impregnation AktuellImpregnation { get; }
+
+        void SetClient(Client client, bool notification = true);
+        void SetProject(Project project, bool notification = true);
+        void SetBuildingSite(Buildingsite buildingsite);
+        void SetSewerObject(SewerObject sewerObject, bool notification = true);
+        void SetSewerDamage(SewerDamage sewerDamage, bool notification = true);
+        void SetImpregnation(Impregnation impregnation, bool notification = true);
+        void ResetProject();
+        void ResetBuildingSite();
+    }
+}