City-13.vcd: Please place this file in C:\Program files\Valve\steam\steamapps\folder with same name as your steam account\half-life 2\hl2\scenes

City-13.ain: Please place this file in C:\program files\valve\steam\steamapps\folder with same name as your steam account\half-life 2\hl2\maps\graphs

City-13.bsp: Please place this file in C:\program files\valve\steam\steamapps\folder with same name as your steam account\half-life 2\hl2\maps

Purple reflections on surfaces?

If for any reason this error accurs, please pull down the console and type "buildcubemaps" in it and hit enter. After the process has finished, the problem should go away.


A.I. disabled?

If you receive this error, simply pull down the console and type "ai_disable 0" into it then hit enter.