Okay, I have been working on a L4D2 Map called "Downed" and the Navigation Meshes are Built, but when I play survival mode on it, I start the survival round but no zombies spawn. It keeps saying "Director Failed to spawn a Special" over and over.
Is there something I am doing wrong? I did put info_zombie_spawn pretty much everywere!
I am getting frustrated that I have worked on this map for weeks, but it still won't work.

If anyone can help in any way, here is all the files needed to open it in L4D2 Authoring Tools: Downed.zip
Please don't steal and take credit.