viewmodel ins wpf gepackt, build failed

DaSaSo.Wpf/ViewModel/Commands/SelectProjectCommand.cs

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+using DaSaSo.Wpf.ViewModel.Interface;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.Wpf.ViewModel.Commands
+{
+    public class SelectProjectCommand : AsyncCommandBase
+    {
+        private readonly IActualProject _actualProject;
+        private readonly ProjectListViewModel _projectListViewModel;
+        public override bool CanExecute(object? parameter)
+        {
+            return _projectListViewModel.SelectedProject != null;
+        }
+
+        public SelectProjectCommand(IActualProject actualProject, ProjectListViewModel projectListViewModel)
+        {
+            _actualProject = actualProject;
+            _projectListViewModel = projectListViewModel;
+            _projectListViewModel.PropertyChanged += _projectListViewModel_PropertyChanged;
+        }
+
+        private void _projectListViewModel_PropertyChanged(object? sender, PropertyChangedEventArgs e)
+        {
+            if (e.PropertyName == nameof(_projectListViewModel.CanSelectProject))
+                OnCanExecuteChanged();
+        }
+
+        public override async Task ExecuteAsync(object? parameter)
+        {
+            var s = _projectListViewModel.SelectedProject;
+            _actualProject.SetProject(s);
+        }
+    }
+}