Garry's Mod

Garry's Mod

Background NPCs - Fill the world
LUA Error Detected
I have this error that occured whenever I try to load up the map I wanted to use:
[Background NPCs - Fill the world] lua/background_npcs_core/classes/sh_dv_class.lua:118: Tried to use a NULL entity!
1. SetPos - [C]:-1
2. AddPassenger - lua/background_npcs_core/classes/sh_dv_class.lua:118
3. SetDriver - lua/background_npcs_core/classes/sh_dv_class.lua:94
4. func - lua/background_npcs_core/classes/actor/sh_actor_base.lua:1550
5. unknown - lua/slib_framework/override/entity/sh_entity.lua:178

As a result, none of the NPCs appear. even when I try fidget around the settings, they still wouldn't appear. Any suggestions?