HumanoidRootPart is not a valid member of model?

So i am trying to make a Keybind door, E to topen, it works, but the "E" image doesn't show up and i guess it is because of this error at line 21.

local inputservice = game:GetService("UserInputService")

inputservice.InputBegan:connect(function(i,g)
	if i.UserInputType == Enum.UserInputType.Keyboard then
		if i.KeyCode == Enum.KeyCode.E then
			for _,Door in pairs(workspace.Doors:GetChildren()) do
				local Mag = (Door.Center.Position-game.Players.LocalPlayer.Character.HumanoidRootPart.Position).magnitude
				if Mag <= Door.Range.Value then
					Door.Event:FireServer()
					break
				end
			end
		end
	end
end)


while true do
	script.Parent.ImageLabel.Visible = false
	for _,Door in pairs(workspace.Doors:GetChildren()) do
		local Mag = (Door.Center.Position-game.Players.LocalPlayer.Character.HumanoidRootPart.Position).magnitude
		if Mag <= Door.Range.Value then
			local D3ToD2 = workspace.CurrentCamera:WorldToScreenPoint(Door.Center.Position)
			script.Parent.ImageLabel.Visible = true
			script.Parent.ImageLabel.Position = UDim2.new(0,D3ToD2.X,0,D3ToD2.Y,0)
			break
		end
	end
	wait()
end