Collisions not working

[Xera_0 (ItsNotXera)]

Hello,
I want to remove collisions between players in my game. I had a script a few years ago but apparently they changed collisions group last year: Updates to Collision Groups

I changed a few things about my code but I can’t figure out something:

I have this error when I join the game

Here is my code:

script.Parent = game:GetService("ServerScriptService")
local PhysService = game:GetService("PhysicsService")
local PlayerGroup = PhysService:RegisterCollisionGroup("p")
PhysService:CollisionGroupSetCollidable("p","p",false)

function NoCollide(model)
	for k,v in pairs (model:GetChildren()) do
		if v:IsA"BasePart" then
			v.CollisionGroup(v,"p")
		end
	end
end

game:GetService("Players").PlayerAdded:connect(function(player)
	player.CharacterAdded:connect(function(char)
		char:WaitForChild("HumanoidRootPart")
		char:WaitForChild("Head")
		char:WaitForChild("Humanoid")
		wait(0.1)
		NoCollide(char)
		if player.Character then
			NoCollide(player.Character)
		end
	end)
end)

Please help

[Moneypro456789]

script.Parent = game:GetService("ServerScriptService")
local PhysService = game:GetService("PhysicsService")
local PlayerGroup = PhysService:RegisterCollisionGroup("p")
PhysService:CollisionGroupSetCollidable("p","p",false)

function NoCollide(model)
	for k,v in pairs (model:GetChildren()) do
		if v:IsA"BasePart" then
			v.CollisionGroup = "p" -- This was the error I think.
		end
	end
end

game:GetService("Players").PlayerAdded:connect(function(player)
	player.CharacterAdded:connect(function(char)
		char:WaitForChild("HumanoidRootPart")
		char:WaitForChild("Head")
		char:WaitForChild("Humanoid")
		wait(0.1)
		NoCollide(char)
		if player.Character then
			NoCollide(player.Character)
		end
	end)
end)