hello i have set the npc spawning in the preferences But there are none coming. Ask for help

"NPCs": {
"Amount To Spawn": 25,
"Blacklisted": [
"Bandit Camp",
"Outpost",
"Junkyard"
],
"Despawn Inventory On Death": false,
"Enabled": true,
"Minimum Amount To Spawn": 6,
"Random Names": [],
"Spawn Murderers": false,
"Spawn Murderers And Scientists": false,
"Spawn Random Amount": false,
"Spawn Scientists Only": true

same problem! Do you need bot spawn for this option?