Time Capsule/Time Machine OS Extended (journaled) error

I have been getting an error on my time machine with my time capsule saying it is not in OS Extended (journaled) format. I first got this error on Saturday. Reselected the disk on my time capsule and it seemed to fix it until today when I got the error again. There is a Windows PC that is connected to one of the ethernet ports but it has been connected for a couple weeks now and I'm not sure what it could be doing to cause the issue if it is causing the issue. I've attached a screenshot of the error that I'm getting if that helps anyone.

thanks in advance

 

Mac OS Extended (Case-sensitive, Journaled) is the format it is in. I read that is has something to do with power nap so maybe it isn't more than a nuisance. I hit back up now and it works so I'm not sure what is causing it.