It only means that your home hub is not reachable at the moment either your hub is down or there is a network problemen in between your hub and your wallet (no drama here indeed).
I am getting the same error. Is it something to do with the wallet upgrade?
Are there multiple options to change the hub? When I look at the preferences, there is only one option - byteball.org/bb
I do my wallet update 2 hours ago and i had this error befor!!! and after the update.