Control has already been added to another page: {}".format(ctrl)

[hoangde2811]

Dear developer!!
I create a progress to wait for data to load, for that I used dialog and have await page.update_async , when opening a browser tab there is no problem but opening another browser tab gives an error as attached picture.
Please help me so I can run multiple tabs.
Sincerely thank you.

[FeodorFitsner]

Please provide sample code reproducing the issue.

[hoangde2811]

ERROR:asyncio:Task exception was never retrieved
future: <Task finished coro=<__connect_internal_async..on_event() done, defined at C:\NewFlet\lib\site-packages\flet\flet.py:361> exception=Exception("Control has already been added to another page: alertdialog {'open': True, 'modal': False, 'actionsalignment': 'end'}")>
Traceback (most recent call last):
File "C:\NewFlet\lib\site-packages\flet\flet.py", line 364, in on_event
Event(e.eventTarget, e.eventName, e.eventData)
File "C:\NewFlet\lib\site-packages\flet_core\page.py", line 456, in on_event_async
await handler(ce)
File "D:\backup\Python\NewFlet\views\login.py", line 65, in login
await ProgressBar(page).show()
File "D:\backup\Python\NewFlet\Utils\progress_bar.py", line 23, in show
await self.page.update_async()
File "C:\NewFlet\lib\site-packages\flet_core\page.py", line 264, in update_async
r = await self.__update_async(self)
File "C:\NewFlet\lib\site-packages\flet_core\page.py", line 368, in __update_async
self.__validate_controls_page(added_controls)
File "C:\NewFlet\lib\site-packages\flet_core\page.py", line 395, in __validate_controls_page
"Control has already been added to another page: {}".format(ctrl)
Exception: Control has already been added to another page: alertdialog {'open': True, 'modal': False, 'actionsalignment': 'end'}

Above is the error code when opening 2 browser tabs.
(https://user-images.githubusercontent.com/87251371/226088895-0030186d-c778-4501-b6ca-c57e93c2f873.png) and here is my progress dialog file.
(https://user-images.githubusercontent.com/87251371/226089756-dffb1db1-2df3-40f8-855f-52231edf759b.png) and here is my main file
Sincerely thank you.