Brick not appearing in Play mode?

This is a normal script inside of ModuleScript that is inside of StarterGui

Filtering enabled is on

--Pieces
repeat wait() until script.Parent.Parent.Parent.Parent
local Player = script.Parent.Parent.Parent
local Mouse = Player:GetMouse()
local slab = script.Parent.Parent.Refrences.Slab:Clone()

Mouse.Button1Down:connect(function()
	if script.Parent.Parent.MaterialPicker.Placing.Value == true then
		wait(.1)
		local SlabClone = Player.Character.Slab:Clone()
		SlabClone.Parent = game.Workspace
		SlabClone.Transparency = 0
		SlabClone.CanCollide = true
	end
end)

while true do
	wait(.1)
	if script.Parent.Parent.MaterialPicker.Placing.Value == true then
	slab.Parent = Player.Character
--	local material = script.Parent.Parent.MaterialPicker.MainFrame.CurrentMaterial.Value
	local x = math.ceil(Mouse.Hit.p.X)-2
	local z = math.ceil(Mouse.Hit.p.Z)-2
	local y = math.ceil(Mouse.Hit.p.Y)-2
	x1 = x%4
	y1 = y%4
	z1 = z%4
	x2 = x + (4 - x1)
	y2 = y + (4 - y1)
	z2 = z + (4 - z1)
	slab.CFrame = CFrame.new(x2,y2,z2)
	slab.Transparency = .5
	--	slab.Material = Enum.Material.material
	slab.CanCollide = false
	else
		slab.Transparency = 1
	end
end

Did you anchor it? XD