Please try the following steps to see if the issue is resolved:
*Confirm if your device meets the system requirements.
If your device does not meet the system requirements, the app may not launch.
*Restart the game app. Close the app and try restarting the game.
*Restart your smartphone. Turn off your device and turn it back on.
*Switch to a stable network or switch from Wi-Fi to cellular data.
If you are using a 4G/5G network, please make sure to check if your data speed is not limited.
*Set the graphics settings to a lower level (when the game launches).
You can change this by going to the home screen > Menu (three-line icon in the upper right corner) > Graphics.
*If you are using an Android device with a microSD inserted, check the location where the app is installed.
(If you confirm that the app is installed on the microSD card, please move it to the main unit storage.)
If the above steps do not resolve the issue, please check the system requirements.