I just got this error a couple hours ago myself for the first time actually but if I hit OK it loads just fine the only thing I have noticed is the Substance Demos are greyed out saying “Syncing”. I can log in and still have a valid sub. Was working just fine had to restart it cause of Windows update and suddenly error but working…o.O" hopefully it stays this way or better is fixed cause I have stuff I need to work on over the weekend.