Well recently me and a friend got this odd error, it may be from sharing accounts it may not, but I'll write some info on how to get past it... It's pretty simple
If you're getting this error:

I found a way to solve it. It's simple... Just re-extract the client and update, and it should be gone. I'm yet to re-open, but I'll do it later, and see if it works still. Hope this contributes to you guys, good luck ^^!