There is a current problem in syncing with seriesguide cloud
Can you please be more specific what your issue is? E.g. what are you trying to do? What do you expect to happen?
I receive this message also, is been happening for a week or two. Basically I mark a show as watched and I get the message there was an error synching to the cloud, please try again later. I can confirm when switching between tablet and phone that the changes are not synching. It happens on both devices.
This is probably due to the TMDb migration, see TMDb Migration Issues and Questions for details.