Board Thread:Help and Questions/@comment-112.215.36.144-20160708111641/@comment-26005122-20160708135457

Try to completely close the app and then reopen it. If you're still getting the message, it means your files are corrupt. The only way to fix it is to delete and reinstall. If you've been playing using a LINE account, you'll keep all your data when you log in again. If you were using a Guest account, unfortunately, you're going to lose all your progress.