Error Logs--ERROR test RegisterDisplay Cannot get display profile

Hello, I am new to this application and keep getting the following error.

7584 0d271b3 2021-07-22 07:07 XMDS POST ERROR test RegisterDisplay Cannot get display profile

I saw a possible fix, in the community, but it did not work. Or maybe, I did not apply correctly.

Our Displays are Raspberry Pi with linux style OS. I have made that as the only Defualt profile, I have restarted the RPI and application. Still get the error on both scheduled event or immediate deployment.

Version of app is

Xibo Digital Signage - www.xibo.org.uk. Version 2.3.10
Copyright © 2006-2021 Xibo Signage Ltd and the Xibo Developers.

Appreciate your help

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