Ошибка в flet python

 import time 
 
import flet as ft 
 
def main(page: ft.Page): 
    # add/update controls on Page 
    page.title = "Test" 
    def destroy_check(objs): 
        for val in objs: 
            page.remove(val) 
        page.update() 
    def add_clicked(e): 
        if new_task.value == "" or new_task.value == " ": 
            page.open(dlg) 
        else: 
            chckb = ft.Checkbox(label=new_task.value) 
            cl = ft.FilledButton(text="Delete", on_click=lambda s: destroy_check([chckb, cl])) 
            page.add(ft.Row([chckb, cl])) 
            new_task.value = "" 
            new_task.focus() 
            new_task.update() 
 
    def close_dialog(e): 
        page.close(dlg) 
 
    new_task = ft.TextField(hint_text="Задача", label="Поле 1") 
    dlg = ft.AlertDialog(title=ft.Text("Поле не может быть пустым"), modal=True, 
                         actions=[ft.TextButton("Ok", on_click=close_dialog)]) 
    page.add(ft.Row([new_task, ft.ElevatedButton("Добавить", on_click=add_clicked)])) 
 
 
ft.app(target=main, port=5562, host="0.0.0.0") 

 Future exception was never retrieved 
future: <Future finished exception=ValueError('list.remove(x): x not in list')> 
Traceback (most recent call last): 
  File "C:\Users\Yaros\AppData\Local\Programs\Python\Python310\lib\concurrent\futures\thread.py", line 52, in run 
    result = self.fn(*self.args, **self.kwargs) 
  File "C:\Users\Yaros\PycharmProjects\FletExample\.venv\lib\site-packages\flet_core\page.py", line 944, in wrapper 
    handler(*args) 
  File "C:\Users\Yaros\PycharmProjects\FletExample\main.py", line 17, in <lambda> 
    cl = ft.FilledButton(text="Delete", on_click=lambda s: destroy_check([chckb, cl])) 
  File "C:\Users\Yaros\PycharmProjects\FletExample\main.py", line 10, in destroy_check 
    page.remove(val) 
  File "C:\Users\Yaros\PycharmProjects\FletExample\.venv\lib\site-packages\flet_core\page.py", line 766, in remove 
    self._controls.remove(control) 
ValueError: list.remove(x): x not in list