Source 2013 : Failed to create unknown entity type, func_instance

Hi guys,

I'm actually working again on source and I met some troubles. Trying to compile map with func_instance, they are fine in hammer but they are not working in game. Also I have this message in console :

Attempted to create unknown entity type func_instance! Can't init func_instance

Looks like the engine doesn't know func_instance BUT, I'm using "source SDK base 2013 Singleplayer" that should have the instance system working (read that several time on the web)

Somebody already experienced that ?

Thanks, it's working now.