App Tray can't work?

[nyrf]

I followed https://github.com/DioxusLabs/dioxus/blob/master/packages/desktop/README.md#app-tray, and it seems can't work

error[E0425]: cannot find value `GlobalTray` in this scope
  --> src\main.rs:21:9
   |
21 |         GlobalTray {
   |         ^^^^^^^^^^ not found in this scope

error[E0425]: cannot find value `MenuGroup` in this scope
  --> src\main.rs:22:13
   |
22 |             MenuGroup {
   |             ^^^^^^^^^ not found in this scope

error[E0425]: cannot find value `MenuGroupItem` in this scope
  --> src\main.rs:23:17
   |
23 |                 MenuGroupItem { title: "New File", shortcut: "cmd+N", onclick: move |e| {} }
   |                 ^^^^^^^^^^^^^ not found in this scope

error[E0425]: cannot find value `MenuGroupItem` in this scope
  --> src\main.rs:24:17
   |
24 |                 MenuGroupItem { title: "New Window", shortcut: "shift+cmd+N", onclick: move |e| {} }
   |                 ^^^^^^^^^^^^^ not found in this scope