Is your Game time About to Expire ? I got that same Error and it was due to my Credit card not being Billed yet. Had Account status : Pending under Bnet account page.
Apparently my accounts locked due to suspicious log in activity. Weird thing is, when I fill my info to unlock it, it says I'm missing required info so I can't unlock it...
This happened to a lot of people a few weeks ago. It might be the same bug. They had a blue post about it. They said there was nothing wrong with the account, but that the app was bugged.
