Hi Kevin
The message you’re getting says that you have a region with no valid media in it. If you have a look in the layout designer there will either be a region with nothing in it at all (in which case delete the region) or you have a region with a media type that Xibo for Android doesn’t support - for example PowerPoint.
A “simple layout with only a background image” would also be invalid as it has no regions on it. A valid layout must have at least one region, and all regions must have at least one media item in them.
It would be well worth having a look over this FAQ as it explains some of that in more detail:
If that doesn’t sort it out, some information on exactly what is on your layout and screenshots of the status screen within Xibo for Android will help us understand the issue.
If you’d prefer not to post those publicly, please log a ticket with the Spring Signage Helpdesk (https://springsignage.freshdesk.com)
Best wishes
Alex