I recently decided to start up Gmod again after taking a rather long break from it. I tried to join a multiplayer server and get a pop up message saying “This Steam account has been used to log in from another computer. To continue using Steam, you need to log in again.” I double checked and I am not logged in on any other computer in the house. I can play online with any other Steam game or mod. Can anyone help me out here? What do I do to fix this.
I have a fresh install of the game.
Here is a picture.