[Python] Python Flet - AttributeError: 'str' object has no attribute '_set_attr_internal'

I tried to make a class to activate and deactivate admin mode (hide or not some element) to my flet app:

class lock(ft.UserControl):
def __init__(self,page:ft.Page):
super().__init__()
self.page =page

def on_lock_click(self,e):
self.page.dialog = self.dlg
self.dlg.open = True
self.page.update()

def on_dlg_activate(self,e):
if self.entry.value == "myPw":
print('good')
self.dlg.open = False
else:
print('bad')
self.page.update()


def build(self):
self.entry = ft.TextField(label='Password')
self.dlg = ft.AlertDialog(
title = 'Admin',
content = self.entry,
actions = [
ft.ElevatedButton(
'log',
on_click= self.on_dlg_activate
)
]

)
return ft.IconButton(
icon= ft.icons.LOCK,
on_click= self.on_lock_click
)


As you can see, this class is composed of a button who is supposed to be called the AlerteDialog when clicked. But when I execute my code I got this error:

Exception in thread Thread-4 (on_lock_click):
Traceback (most recent call last):
File "C:\...\Programs\Python\Python311\Lib\threading.py", line 1045, in _bootstrap_inner
self.run()
File "C:\...\Programs\Python\Python311\Lib\threading.py", line 982, in run
self._target(*self._args, **self._kwargs)
File ".\soft\src\widgets\lock.py", line 11, in on_lock_click
self.page.update()
File "C:\...\Local\Programs\Python\Python311\Lib\site-packages\flet_core\page.py", line 299, in update
r = self.__update(self)
^^^^^^^^^^^^^^^^^^^
File "C:\...\Local\Programs\Python\Python311\Lib\site-packages\flet_core\page.py", line 431, in __update
commands, added_controls, removed_controls = self.__prepare_update(*controls)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\...\Local\Programs\Python\Python311\Lib\site-packages\flet_core\page.py", line 456, in __prepare_update
control.build_update_commands(
File "C:\...Local\Programs\Python\Python311\Lib\site-packages\flet_core\control.py", line 411, in build_update_commands
ctrl.build_update_commands(
File "C:\...\Local\Programs\Python\Python311\Lib\site-packages\flet_core\control.py", line 423, in build_update_commands
innerCmds = ctrl._build_add_commands(
^^^^^^^^^^^^^^^^^^^^^^^^^
children = self._get_children()
^^^^^^^^^^^^^^^^^^^^
File "C:\...\Local\Programs\Python\Python311\Lib\site-packages\flet_core\alert_dialog.py", line 134, in _get_children
self.__title._set_attr_internal("n", "title")
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^


I read the flet documentations about AlertDialog: [text] (https://flet.dev/docs/controls/alertdialog) But I don't see the solution to my problem. Any idea?

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