Please restart your device and re-install the app under the stable network connection.
Also, please note that there is a possibility that your OS version is older than 2.1 if the above method don't help you with the issue.
If this is the case, please update the Android version of your device, and then retry installing the game.
**How confirm the OS version:
Setting >Device info >Firmware version
Kindly refer to your device manual and contact your service provider regariding questions about updating the OS version.
*Before updating, please make a backup of your mobile data as it is possible that the data will be deleted after the update.