You may see this message for many reasons, and at different times. As weird as it may sound, all it really means is that the app on your mobile device could not successfully 'talk' to the servers at Dave H.Q.
What should you do?
Usually, taking a break and trying again later will resolve most issues, but occasionally it could be an indication of a bug, or in the very rare instance, it could mean a server has gone down for maintenance or repair.
If the problem persists over 24 hours, please contact customer support so we can dig into it for you.