Hi Carlo,
There is not much information to go on there, friend. You have tolds us several things specifically that work, and one (Device and/or Integration) gives that error.
The best any of us can answer to that is something is wrong with the Device and/or Integration that is unnamed when you try to notify it or it tries to notify something else.
The FAQ may be able to help you formulate a better question . Please help us help you.
https://community.home-assistant.io/t/how-to-help-us-help-you-or-how-to-ask-a-good-question.