how to deal with "the trait bound `ObjectImplRef<imp::Window>: IsA<gtk4::Window>` is not satisfied" in gtk4-rs?

I use gtk4-rs to build a gui program. the 1st parameter of the select_folder function shows an error: "the trait bound ObjectImplRef<imp::Window>: IsA<gtk4::Window> is not satisfied"

impl ObjectImpl for Window {
    fn constructed(&self) {
        self.parent_constructed();
        let window = self;
        self.file_button.connect_clicked(glib::clone!(
            #[weak]
            window,
            move|_|{
                let dialog = FileDialog::builder()
                .title("choose a directory")
                .accept_label("confirm")
                .modal(true)
                .build();
                dialog.select_folder(Some(&window), gio::Cancellable::NONE, |path|{
                    if let Ok(filepath) = path {
                        println!("{}", filepath.path().unwrap().to_string_lossy());
                    }
                });
            }
        ));
    }
}

but I checked many times , configurations are correct, anyone has encountered this? my configurations: mod imp;

use glib::Object;
use gtk::{gio, glib, Application};


glib::wrapper! {
    pub struct Window(ObjectSubclass<imp::Window>)
        @extends gtk::ApplicationWindow, gtk::Window, gtk::Widget,
        @implements gio::ActionGroup, gio::ActionMap, gtk::Accessible, gtk::Buildable,
                    gtk::ConstraintTarget, gtk::Native, gtk::Root, gtk::ShortcutManager;
}

impl Window {
    pub fn new(app: &Application) -> Self {
        // Create new window
        Object::builder().property("application", app).build()
    }
}

imp.rs:

use gtk::glib::subclass::InitializingObject;
use gtk::{gio, prelude::*, FileDialog};
use gtk::subclass::prelude::*;
use gtk::{glib, Button, CompositeTemplate};


#[derive(CompositeTemplate, Default)]
#[template(resource = "/com/****/zsyn/window.ui")]       //path is right
pub struct Window {
    #[template_child]
    pub file_button: TemplateChild<Button>,
}

#[glib::object_subclass]
impl ObjectSubclass for Window {
    const NAME: &'static str = "MainWindow";
    type Type = super::Window;
    type ParentType = gtk::ApplicationWindow;

    fn class_init(klass: &mut Self::Class) {
        klass.bind_template();
        // klass.bind_template_callbacks();
    }

    fn instance_init(obj: &InitializingObject<Self>) {
        obj.init_template();
    }
}

impl ObjectImpl for Window {
    fn constructed(&self) {
        // Call "constructed" on parent
        self.parent_constructed();
        let window = self;
        self.file_button.connect_clicked(glib::clone!(
            #[weak]
            window,
            move|_|{
                let dialog = FileDialog::builder()
                .title("choose a directory")
                .accept_label("confirm")
                .modal(true)
                .build();
                dialog.select_folder(Some(&window), gio::Cancellable::NONE, |path|{
                    if let Ok(filepath) = path {
                        println!("{}", filepath.path().unwrap().to_string_lossy());
                    }
                });
            }
        ));
    }
}

// Trait shared by all widgets
impl WidgetImpl for Window {}

// Trait shared by all windows
impl WindowImpl for Window {}

// Trait shared by all application windows
impl ApplicationWindowImpl for Window {}

xml templates are also correct, because if I comment the callback of the button, it is all right.