Im trying to make this character turn into the roblox character, but it wont work. I wonder why?

Hello! I am trying to make this character turn into ROBLOX but it wont work. And it keeps throwing an error saying "HumanoidDescription is not a valid member of Humanoid." but there is a HumanoidDescription in the model! I also do have a loop that keeps running just in case if the character changes. Anyways, here is the script that is in the character model

local model = script.Parent
local userid = 1
model.Humanoid.HumanoidDescription = game.Players:GetHumanoidDescriptionFromUserId(userid)
script.Parent.Name = "ROBLOX"
print("Loaded!")
while wait(10) do
	model.Humanoid.HumanoidDescription = game.Players:GetHumanoidDescriptionFromUserId(userid)
	script.Parent.Name = "ROBLOX"
	print("Loaded!")
end

It is actually super simple. Just name your character "StartCharacter" and place it in StarterPlayer. No scripting needed. Please note: don't place it in StarterCharacterScripts or StarterPlayerScripts, just StarterPlayer will do.