Datagrid 'edititem' is not allowed for this view

public partial class MainWindow : Window
    {              
        public MainWindow()
        {
            InitializeComponent();
        }
 
        public  class  MyDataGrid2
        {         
            public string speed { set; get; }
            public string environment { set; get; }
           
        }        
       
        public void AddGrid2()
        {
            datagrid_path.Items.Add(new MyDataGrid2() {  speed = "", environment="" });
        }
    }

List<MyData> calls = new List<MyData>();
            calls.Add(new MyData() { Type_isso = Type_isso_form2, Address = "", Properties = Length + ";" + Heigth });
            
            ListCollectionView view = new ListCollectionView(calls);
            datagrid.Items.Add(view);

           List<MyData> calls = new List<MyData>();
            calls.Add(new MyData() { Type_isso = Type_isso_form2, Address = "", Properties = Length + ";" + Heigth });
            
            ListCollectionView view = new ListCollectionView(calls);
           datagrides.ItemsSource = view;