Help about the app "Announcement center"

I uploaded the Nextcloud app “Announcement center” but when I create a widget on the dashboard, it doesn’t shows the annoncements and there is only a circle that shows that it’s loading but never ending. Even if I’m uploading the page, it never works. Do you know if it is a curent bug ? Can you help me finfing a solution ?
(Sorry for my english, I’m french).