Spawning NPCs through map problem

Hello, on the map I’m working on I created a “npc_template_maker” to spawn zombies. I tested it out in hl2 and it worked, I tested it out on gmod singleplayer and it works, but why doesn’t it work on gmod when i make a server? I do a create multiplayer with the map and the zombies don’t even spawn. I even made sure the maxnpcs wasn’t 0 and the settings were the exact same as singleplayer. Any ideas to why this doesn’t work?