Jewish Calendar no longer working

I am now seeing the following

This entity is no longer being provided by the jewish_calendar integration. If the entity is no longer in use, delete it in settings.

Does anyone know what the problem is?

First of all:

Without further info i can only go by what u posted.

This entity is no longer being provided by the jewish_calendar integration. If the entity is no longer in use, delete it in settings.

That usually means that the integration is not running for some reason, or it has been changed.
What do your logs say?