NPC problem

Hi, i just recently started a server, and successfully was able to upload a few things into it. However, when ever i try to spawn an npc, it tells me that i have hit the npc limit. Forums, are always my last resort and after searching google and finding nothing, i have turned to facepunch. so anyone who can answer this please do so.

Did you, perhaps unknowingly buy a build only server?

Go to the options tab and set the NPC Limit slider to 200.