Can somebody help me properly call PlayerGui?

local Players = game:GetService("Players")


local function onPartTouch(identifier)
	local partParent = identifier.Parent
	local humanoid = partParent:FindFirstChildWhichIsA("Humanoid")
	local player = Players:GetPlayerFromCharacter(partParent)
	local getplayerz = game.Players:GetChildren("Player")
	if humanoid and player.Name == "SamZeKat" then
		
		
		
		
		getplayerz.PlayerGui.yes.Enabled = true
		
		
	end
end

script.Parent.Touched:Connect(onPartTouch)

Coming with the error: Attempted to index with nil yes