Attempt to index nil with transparency???

WHY DUS THIS HAPEN TO MEEEEEEEE forget the rest of the song Anyways

Im getting the error "Attempt to index nil with 'transparency' " and it makes no sense to me Its not like I can use wait for child for a parent makes no sense

script:

script.Parent.Touched:Connect(function(hit)
	local character = hit.Parent
	if character:FindFirstChild('Humanoid') then
		local player = game.Players:GetPlayerFromCharacter(character)
		script.Parent.Transparency = 1
		script.Parent.CanCollide = false
		script.Disabled = true
		player:WaitForChild('leaderstats'):WaitForChild('DollarsToCollect').Value = player.leaderstats.DollarsToCollect.Value + 1
		wait(20)
		script.Parent.Transparency = 0
		script.Parent.CanCollide = true
		script.Disabled = false
	end
end)

Wait! Something else that should be noted it works the first time, but not the second, it becomes invisible, but not visible again