What does this mean?
Honestly, it's hard to say -- you may see this message for many reasons and at different times.
As weird as it may sound, all this error message 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 lasts for over 24 hours, message our customer support and we'll do our best to sort it out.