Board Thread:Question and Answer/@comment-19043637-20140830173244/@comment-25133996-20140831135126

Try to redownload VC again from appstore. If it doesn't work also, then you might need to first link your account to the SNS platform then clear the data of VC.

Relax, linking your account to the SNS platform will tie your account to the server. You will not lose your game data even if you delete/redownload the app, or clear the app data.