SetupArrayProps R: array prop 'null' is at index zero
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The startup error SetupArrayProps R: array prop 'null' is at index zero is caused by trying to run a Source 2007 game/mod with the Source 2009 engine. This is not possible.
Solution
The only Source 2007 game left today is Source SDK Base 2007. To use it:
- Make the AppID in your gameinfo.txt file is 218. Restart Steam after changing it.
- Make any sure that any paths to hl2.exe (such as the launch path for the Visual Studio debugger) are pointing to
SteamApps/account_name/source sdk base 2007/hl2.exe
To access content from a 2009 game while still using the 2007 engine, see mounting multiple games.