loading map error; CD Key authentication invalid

[Recom]

Hi!

I hope somebody can help me with this.

I just started into SDK and set up my mod. So far I could handle all the errors I encountered and I can start the mod. But when loading a map (dm_lockdown) I get disconnected with this error message in the console:

*********************************************************
*	Unable to load Steam support library.*
*	This server will operate in LAN mode only.*
*********************************************************
'listenserver.cfg' not present; not executing.
CD Key authentication invalid for internet servers.

During my research I couldn't find any thread or hint that somebody had this error during modding, only with certain games such as CSS

http://css.setti.info/forum/topic/1380-counter-strike-source-orange-box-nosteam-setti/page__st__3380

They got the very same error, but got fixed with a patch.


Help would be awesome!


Notes:
I created a Half-Life MP_DM mod
I'm using VS2012 with a VS2010 express platform tool

 

[JonnyBoy0719]

This happens if you don't own the game on steam legally. If its a mod for HL2: DM, bought from steam, then Re-Install HL2: DM and SDK Base 2006/2007 and/or other content the mod is using as base.