It's crazy that this error has been going on for over 10 YEARS! and still haven't been fixed..like come on.. how do ya expect us to play OUR games in your app that doesn't work. Now I can't play the games I want to since EVERYTIME I LOG IN THE GOG GALAXY APP I GET THE SAME ERROR I HAVE BEEN GETTING SINCE LAST MONTH..

I just faced this error and fixed it by logging on website first. It asked me to provide 4 digit code that was sent on my email.