Why wont this script work on the server?

local player = script.Parent.Parent.Parent.Parent
local playerc = player.Character
local P = playerc.Humanoid
while true do 
wait(0.1) 
if P.Health == 0 then 
script.Parent.Parent.WastedBlur.Visible = true 
script.Parent.Visible = true 
script.Parent.LocalScript.Static:play()
wait(4)
script.Parent.Visible = false 
script.Parent.Parent.Frame2.Visible = true
wait(1.5)
end
wait()
end

this script is in screen gui it is in a wested gui. so basically i want it to appear when the players health is 0. this works in single player roblox studio but it wont work on the roblox server. why wont it work on the roblox server?