Is the iDevice that you are using for iEra jailbroken and has the application you get from Cydia, "UDID Faker"? If you do have this, then just go back into Cydia and uninstall it. Another way you can get rid of it is to restart the iDevice which would make the Jailbreak go away.
The only way (that I know of) where you can get that error is if you do have "UDID Faker". The server automatically detects it on your iDevice and wants you to take it off your iDevice. If I were you, I'd delete it.
1. It can get really annoying (the pop-up)
2. Every price in the game is x2 it;s original price. You would have to work extra hard to be able to buy stuff. (example: A BAR - Original Cost: 200,000 Gralats. Cost With UDID Faker: 400,000 Gralats., Light Saber - Original Cost: 100 EC. Cost With UDID Faker: 200 EC.)