What does this mean?
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 larger issue.
If the problem persists over 24 hours, please email customer support at email@example.com