Trying to change the decal ID while playing?

This script just places the number id inside the decal but the decal is not shown, any help?

function event.OnServerInvoke(player,id,color)
    local prefix ="rbxassetid://"
    local color = BrickColor.new(color)
    local image = (prefix..id)
    local parts = workspace.Banners:GetChildren()
    if color then
    for i,v in pairs(parts) do
        if v.Name == "Cloth" then
            v.BrickColor = color
        elseif v.Name == "Crest" then
            v.Decal.Texture = id
        end
    end
    else return "Invalid Color!"
    end
    return "Banner set!"
end