Page not found when change permalinks structure

Hello,
I receive a “page not found error” when I select a custom structure (or “Article Name” choice) for Permalink.
The widget shows last news correctly but the links to the news seems to be broken. I’ve tried to uninstall and reinstall it without success (moreover the news were not deleted after uninstalling).

If may help, I have a plugin for language choice so this is how the news are linked:
https://namesite.com/it_IT/news/test-news-1/
(note that if I set this language plugin as inactive the permalink changes but News still don’t work)

Any suggestion?

https://www.ads-software.com/plugins/sp-news-and-widget/