Multiscreen ID error screen

Starting with firmware 3.1.0, when publishing a multiscreen project on an HMP device that is not associated to a content area within the multiscreen project, that HMP is displaying an error screen having this text: "Multiscreen ID setup required". When this happens, you need to either associate the player to a content area from Elementi or configure the Multiscreen ID of that player to match a content area.

Notes:

If needed, it is possible to force displaying the full content by explicitly using "fullscreen" as Multiscreen ID on the HMP; this should be done with care to ensure that the HMP can actually display the entire content, because otherwise the HMP would enter into Safe mode.
For firmware lower than 3.1.0, the HMP which is not correctly configured, would try to display the full content or enter otherwise into Safe mode.