Whenever I try to spawn an NPC from gmDoom, it appears as if nothing happens. There is absolutely no indication that anything happened- no black / purple boxes or anything. When I check the console, this is what pops up:

ERROR: Trying to derive entity doom_npc_cyborg from non existant entity doom_npc_base!
Error: Tried to make a SENT (doom_npc_cyborg) but it didn't have a 'Type' key!
Attempted to create unknown entity type doom_npc_cyborg!

It does this with all of the DOOM NPCs, not just the cyborg. Help would be appreciated.