It means that the game doesn't recognize your internet connection for some reason. The first thing you should do is make sure your internet working fine and restart the game. Sometimes you might also need to reconnect your device to your Wi-Fi or choose another hotspot.
If this doesn't help or you're sure there are no problems with the internet connection, try reinstalling the game: in most cases, it does the trick. Please copy your game ID and save it somewhere before you reinstall the game.
But if this doesn't help, contact us via the game settings and describe the problem in detail. We'll do everything we can to help you!