I was having the same issue. It's a problem with the launcher not updating. My girlfriend's launcher updated, but mine did not. I got the version error after logging in, she did not.

I don't know if it was purely coincidence, but, as soon as I temporarily disabled my anti-virus software (Avast), the launcher was able to update itself.

For reference, the latest launcher version is 2015.11.05.0000.0001