Index.RDF missing

If anyone else is getting this message, here is what I found out today from Mattel's customer service:

It usually means a file is corrupt after an update is interrupted (not verbatim, but that's what I remember he said). The solution is to uninstall and reinstall. You won't lose any data since your progress is saved on their server. So as long as you know what your login name & password is, you should be fine. You can download the software from their website: service.mattel.com

This install will get you to version 4.8, and then after you log into the game, it will check for updates and should update to 5.0, the most current version.