Why is the run text not appearing?

What i am trying to do here is that if the zombie spots your torso then u get a text saying to run

the script is a localscript the script is inside the model of the zombie

local larm = script.Parent:FindFirstChild("HumanoidRootPart")
local rarm = script.Parent:FindFirstChild("HumanoidRootPart")


function findNearestTorso(pos)
	local list = game.Workspace:children()
	local torso = nil
	local dist = 10000
	local temp = nil
	local human = nil
	local temp2 = nil
	for x = 1, #list do
		temp2 = list[x]
		if (temp2.className == "Model") and (temp2 ~= script.Parent) then
			temp = temp2:findFirstChild("HumanoidRootPart")
			human = temp2:findFirstChild("Humanoid")
			if (temp ~= nil) and (human ~= nil) and (human.Health > 0) then
				if (temp.Position - pos).magnitude < dist then
					torso = temp
					dist = (temp.Position - pos).magnitude
				end
			end
		end
	end
	return torso
end




while true do
	wait(1)
	local target = findNearestTorso(script.Parent.HumanoidRootPart.Position)
	if target ~= nil then

		local spotted = target.Parent.Name
		
		for i,child in pairs(game.Players:GetChildren()) do
			if child.Name == spotted then
				game.Players:WaitForChild(child.Name).PlayerGui.RUN.Label.Visible=true
				
			end
		end
	
		end
	end

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