This happens because there is a bug in the system, the game server has been updated and upgraded, and the redemption code has expired or has been used up by other players.

1, system bug, game server update and upgrade, etc. If there is a bug in the system, there will be internal system errors and disorder. At this time, you can try to update the game or uninstall and reinstall.

The redemption code has expired or has been used up by other players. The redemption code is time-sensitive and usually invalid. It is recommended to pay attention to the game announcement to get the latest redemption code.