script isn't finding the path even if it exists?

I know this has happened to people before, this always makes me stop developing because of its annoyance...

local p = script.Parent.Parent.Parent.Parent.Parent
local pn = p.Name
local f = game.ServerStorage.PlayerData:FindFirstChild('Store'):FindFirstChild(pn)
if f.Setting1.Value == true then
	--script

I always get an error of something like

attempt to index upvalue 'f' (a nil value)

"try to use WaitForChild instead of FindFirstChild and see if anything changes"

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