STEAM Cloud warning?

Uhm, today when i was about to start GMod a small window appeared, telling me that my STEAM Cloud files wasn’t syncronised and that i could lose my Achievments… Help!
Im too afraid to start GMod right now, does anyone know a solution to this?

[offtopic]
Nobody could care less about your achievments since they could be edited with an achievment manager.
[/offtopic]

Don’t worry about it, i’m pretty sure it means it’s just out of sync. Just restart steam if it’s bothering you that much.

Yeah, i restarted the comp and the Message didn’t show up when i launched GMod again.