https://pastebin.com/8bnK97ww
This is the error I get. I have .bin file. And the folder itself exists. When I rename the folder to Supreme_Commander_Forever , it gets the Supreme_Commander_Forever folder, but same error message.
I reconfirmed the location of the folder in client. I don't get the error again, but the lobby doesn't launch.
Just for reference, game launches normally from Steam. And I have Steam running when trying to join a lobby from witin the client. I followed the instructions from here: https://wiki.faforever.com/index.php?title=Setting_Up_FAF_Linux
EDIT: Seems to be solved for now, I must've misconfigured something during client installation.