This happened a while for me when i played, so what you need to do is:
1. Check your connection, if you're 3g, 4g, w/e g connection is not working properly (has a circle in place) or is slow that is probably the problem. Wi-fi often does the same thing, try resetting a modem or the connection itself.
2. Restart the app, double click the home button and close the app on the bottom. Sometimes you need to start the entire app over again.
If none of those work for you, then submit a ticket to aeriamobile explaining your circumstances. They'll try to help you troubleshoot your problem