viewmodel ins wpf gepackt, build failed

DaSaSo.Wpf/ViewModel/Commands/SelectClientCommand.cs

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+using DaSaSo.Domain.Model;
+using DaSaSo.Domain.Services;
+using DaSaSo.Wpf.ViewModel.Interface;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Input;
+
+namespace DaSaSo.Wpf.ViewModel.Commands
+{
+    public class SelectClientCommand : AsyncCommandBase
+    {
+        
+        private readonly IActualProject _actualProject;
+        private readonly ClientListViewModel _clientListViewModel;
+        private readonly IDataService<Client> _dataservice;
+
+        public override bool CanExecute(object? parameter)
+        {
+            return _clientListViewModel.CanSelectClient;
+        }
+        public SelectClientCommand(
+            IDataService<Client> dataService,
+            IActualProject actualProject,
+            ClientListViewModel clientListViewModel)
+        {
+            _actualProject = actualProject;
+            _clientListViewModel = clientListViewModel;
+            _clientListViewModel.PropertyChanged += ClientListViewModel_PropertyChanged;
+            _dataservice = dataService;
+        }
+
+        private void ClientListViewModel_PropertyChanged(object? sender, PropertyChangedEventArgs e)
+        {
+            if(e.PropertyName == nameof(_clientListViewModel.CanSelectClient))
+            {
+                OnCanExecuteChanged();
+            }
+        }
+
+        public override async Task ExecuteAsync(object? parameter)
+        {
+            Client? _selectedClient = _clientListViewModel.SelectedClient;
+            if (_selectedClient == null) return;
+            _selectedClient = await _dataservice.Get(_selectedClient.Id);
+            _actualProject.SetClient(_selectedClient);
+        }
+        
+    }
+}