I can confirm I also hit this. The problem for me was that on installing Windows 10 anew, it started putting save files in the cloud at OneDrive. After cleaning up that library path and of course properly moving around my PlayerProfiles folder to the Documents folder of my User Profile... I cannot get my this game to properly recognize the Documents folder under my user profile now. Somewhere... in a config file... or a registry entry... it is reading in the location of this old OneDrive Document Library path and since it is gone bombs out with this error when starting the game.
I tried uninstalling, downloading, and reinstalling the game from Steam and it didn't help. It would probably work under a different user account... I imagine... but I don't want to do that and there should be an easy way to fix this damn problem.
