PhysicsService not working

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#1

Hello, for some reason my script for no collision from the player and npc is not working and i don’t know what to do and the script it’s in ServerScriptService and is not showing any type of errors in output, here my script

Ps:CreateCollisionGroup("NPC")
Ps:CreateCollisionGroup("Players")
Ps:CollisionGroupSetCollidable("NPC", "Players", false)

for i, v in pairs(game.Workspace.NPC:GetChildren()) do
	if v:IsA("Part") or v:IsA("MeshPart")  then
		Ps:SetPartCollisionGroup(v, "NPC")
	end
end

game.Players.PlayerAdded:Connect(function(player)
	player.CharacterAdded:connect(function(character)
		for i, v in pairs(character:GetChildren()) do
			if v:IsA("Part") or v:IsA("MeshPart") then
				Ps:SetPartCollisionGroup(v, "Players")
			end
		end
	end)
end)
#2

for the npc you arent allowed to assign a collision group to a Humanoid

#3

i know but i tried because it wasn’t working and without the humanoid…