error while logging in

[ayan01]

i can't log in. there is an error message saying "This account needs to be converted to a Battle.net account. blablabla. click this to begin conversion"

[Zelta]

Make sure you are logging in with your username and password.
If the problem still persists, check this tutorial that will guide you through some fixing steps.

If that still does not help, some of your files might have been modified (by either Blizzard or you) and you should better re-download game from us.