Unable to StartNextLayout

Hello, we are deploying some displays with xibo 2.0 but i got these errors. Can you help with a hint where are they coming from ?

It looks as though the Android Player isn’t able to show the layout. You should open a ticket with our service desk giving as much detail as you can about the versions of the CMS and Players that are in use, and the devices you’re running on. Please email that to support@xibosignage.com and we will assist you.