How can I make my Drop in my tycoon perform this Function?

So I am making a Tycoon and I am having a problem with my drop that gives money. I want it to release with a Decal on the front and back but it will not work :( I don't know what is wrong with this script that someone helped me with. Please help if you can!

The Drop script:

function fire()
        local p = Instance.new("Part")
    local d = Instance.new("Decal", p)
        p.Position = script.Parent.Position
        p.Size = Vector3.new(2, 0.4, 1)
        p.BrickColor = BrickColor.new(37)
        p.BottomSurface = 0
        p.TopSurface = 0
            p.Name = "TycoonBrick"
        p.Parent = script.Parent
    d.Texture = "51041387"
    d.Face = "Front"
    local dd = d:clone()
    dd.Face = Back
    end


    while true do
        wait(2.5)
        fire()
    end

The problem is that when it shoots out a brick it says this "Image failed to load: 51041387: Unexpected URL" and then it just stop shooting bricks. I tried the full URL, the id, and the asset id but nothing will work. Please help!!! Good day :)