First thing is to empty client player cache allways. And check validity of CMS host if reachable.
Or at times your android box if you use that has failed. Downhere we had all from cheap unreliable free hoster to sabotaged boxes. But mostly:
empty your cache
look if connected, list the satus on client to check for.
hoster in the air.
got LAN / WIFI up
motherboard failure
source content temporarily/definitely not more available resulting in invalid layout.
I think I saw this in another post, but no definitive resolution…
UI Thread|10/20/2016 6:32:11 AM|Error|MainForm - ChangeToNextLayout|Prepare Layout Failed. Exception raised was: The process cannot access the file ‘C:\Users\User\Documents\Xibo Library\57.xlf’ because it is being used by another process.
UI Thread|10/20/2016 6:32:11 AM|Error|MainForm - ChangeToNextLayout|Layout Change to C:\Users\User\Documents\Xibo Library\57.xlf failed. Exception raised was: The process cannot access the file ‘C:\Users\User\Documents\Xibo Library\57.xlf’ because it is being used by another process.