I've had this error after I crashed from the game.
Normally it used to upload files again, before I could launch, but not this time.
A solution given was to re download the patch file, which I have attempted many times, but the FTP server gives me a timeout.
I then copy/pasted all the .data files from another install (via a friends version).
Where I couldn't log in before, I can now, and the game is properly running, but yet this error stays.
Any idea when the FTP server will be up again? coz that is probably the problem, since the uploader can't make contact either?