If you are using a Samsung device, please disable Download Booster restart your device and try again.
How to disable Download Booster:
From the Home screen touch Apps.
Locate and then touch Download Booster.
Touch the slider (if it is in the 'on' position) to put it in the 'off' position.
If you're not using a Samsung device, or this fix doesn't get you into the game, please submit a ticket to support with your device details.