NPCs spawning and standing on the air

I am using the custom configuration because my map don't have an air field.

How do I fix that ?

Hey, are you using custom airfield?

I am using the custom configuration because my map don't have an air field.

Yes 

show me your config file please

{
  "Time to event start(in seconds, minimum 900)": 3600,
  "Random time to event start": false,
  "Minimum time to event start(in seconds, minimum 900)": 3600,
  "Maximum time to event start(in seconds)": 3600,
  "Drops amount(number of cargo spawns after plane landing, maximum 10)": 3,
  "Crates amount(spawn every cargo drop)": 1,
  "Crates lifetime(in seconds). The crate will not be destroyed if it has been activated": 3600,
  "Crates timer(in seconds)": 900,
  "Airdrops amount(spawn every cargo drop)": 0,
  "Airdrops lifetime(in seconds)": 7200,
  "NPCs amount(spawn every cargo drop)": 3,
  "NPCs lifetime(in seconds)": 3600,
  "NPCs type(NPCs prefab, experimental setting, it is not known how the NPCs will behave) 0 - tunneldweller; 1 - underwaterdweller; 2 - excavator; 3 - full_any; 4 - lr300; 5 - mp5; 6 - pistol; 7 - shotgun; 8 - heavy; 9 - junkpile_pistol; 10 - oilrig; 11 - patrol; 12 - peacekeeper; 13 - roam; 14 - roamtethered; 15 - bandit_guard; 16 - cargo; 17 - cargo_turret_any; 18 - cargo_turret_lr300; 19 - ch47_gunner": 8,
  "NPCs health(0 - default)": 0,
  "NPCs damage multiplier": 1.0,
  "NPCs attack range": 75.0,
  "Minimum distance to NPC damage": 75.0,
  "Forcibly immobilize an NPC": true,
  "List of kits for each NPC(requires Kits plugin)": [
    "kit1",
    "kit2",
    "kit3"
  ],
  "Default displayName for NPC(for SimpleKillFeed/DeathNotes plugin)": "Airfield NPC",
  "List of displayNames for each NPC(for SimpleKillFeed/DeathNotes plugin)": [
    "Airfield NPC1",
    "Airfield NPC2",
    "Airfield NPC3"
  ],
  "Event message(if empty, no message will be displayed)": "Airfield event started",
  "Calls a helicopter to the airfield after landing a cargo plane": false,
  "How long the helicopter will patrol the airfield (in minutes)": 5,
  "Helicopter damage multiplier": 1.0,
  "Helicopter health": 10000.0,
  "Event marker on the map(will spawn a marker immediately after the start of the event)": false,
  "If true, spawn the marker only after the plane lands": false,
  "Event marker name": "Airfield event",
  "Event marker lifetime(in seconds)": 3600,
  "Event marker transparency(0-1)": 0.75,
  "Event marker radius": 0.5,
  "Event marker color.R(0-1)": 1.0,
  "Event marker color.G(0-1)": 0.0,
  "Event marker color.B(0-1)": 0.0,
  "Use a custom place to land a cargo plane": true,
  "Custom place position": {
    "x": 463.83548,
    "y": 52.19391,
    "z": -116.711395
  },
  "Custom place rotation": {
    "x": 11.6294851,
    "y": 70.3533859,
    "z": -4.35833755E-07
  },
  "Use custom navmesh (enable if using custom airfield and getting NPC navmesh error)": false
}

I tried with "Forcibly immobilize an NPC" True and False.

The error happens with both values.

Try to set "Use custom navmesh" - True

Same problem.

I changed "Forcibly immobilize an NPC" to false, now they're able to walk.

But at first they spawn floating in the air and start to walk normally when a player is spotted.

I would love for them to spawn at the ground.

You have to choose a flat place for the plane to land, then the NPCs will spawn on the ground

Changed Status from Pending to Closed

Changed Fixed In to 1.1.9