Fail in restoring whatsapp chats
Try this, from the Whatsapp FAQ.


  To restore from a backup, follow these steps:
  
  
  Uninstall WhatsApp.
  Decide which backup file you want to restore.
  Rename that file from "msgstore-YYYY-MM-DD.1.db.crypt" to
  "msgstore.db.crypt"
  Install WhatsApp
  When asked to restore, tap [Restore]