So i'm playing with the base mod and Proxy Wars latest version but when i click the start button it does this

The mod Proxy Wars caused a non-recoverable error.
Please report this error to the mod author.

Error while running event Proxy_Wars::on_gui_click (ID 1)
Unknown entity name: player
stack traceback:
Proxy_Wars/scripts/surfaces.lua:20: in function 'teleportPlayer'
Proxy_Wars/scripts/init.lua:86: in function 'startGame'
Proxy_Wars/scripts/gui.lua:3: in function 'onClickedStartButton'
Proxy_Wars/control.lua:176: in function <Proxy_Wars/control.lua:163>
stack traceback:
[C]: in function 'find_non_colliding_position'
Proxy_Wars/scripts/surfaces.lua:20: in function 'teleportPlayer'
Proxy_Wars/scripts/init.lua:86: in function 'startGame'
Proxy_Wars/scripts/gui.lua:3: in function 'onClickedStartButton'
Proxy_Wars/control.lua:176: in function <Proxy_Wars/control.lua:163>

I'm also playing single player. Is there a server for this?
the latest version in modlist is 8.00

I haven't really been doing more than the bare minimum to keep this mod updated for Factorio versions, but it looks like the 0.17 version was either broken the whole time or Factorio broke it between 0.17.0 and current 0.17.

Either way, I'm not sure what Factorio will do if I make a newer version for 0.17 then someone upgrades to 0.18 (it should want to go from 0.0.11 -> 0.0.10, but I'm not sure if it will), so I updated the 0.0.8 version that was out there to fix the issue.

Factorio will not automatically update your mod, so you will need to delete it from your game (either in game or the mods folder) and reinstall it.