Why won't this attachment parent to the character?

I am trying to make it so that the player could equip a halo, but every time I try to equip a halo I get the error: "Parent cannot be assigned to" I don't know what could be causing the issue. Here is the server script:

local function equipHalo(plr,color)
    if plr.HaloInventory:FindFirstChild(color.."Halo") == nil then return "halo" end
    if plr.HaloInventory:FindFirstChild(color.."Halo") then
        local clone = game.ReplicatedStorage.Halos[color.."Halo"]:Clone()
        local char = plr.Character

        if clone ~= nil and char ~= nil then
            if char:FindFirstChild(plr.Name.."'s Halo") then char[plr.Name.."'s Halo"]:Destroy() end
            clone.Name = plr.Name.."'s Halo"
            clone.CFrame = char.Head.CFrame
            local size = clone.Size

            local attatchmentchar = Instance.new("Attachment")
            attatchmentchar.Visible = false
            attatchmentchar = Vector3.new(0,2.5,0) + size
            attatchmentchar.Parent = char:WaitForChild("HumanoidRootPart")

            local attatchmenthalo = Instance.new("Attachment")
            attatchmenthalo.Visible = false
            attatchmenthalo.Parent = clone

            local alignposition = Instance.new("AlignPosition")
            alignposition.MaxForce = 25000
            alignposition.Attachment0 = attatchmenthalo
            alignposition.Attachment1 = attatchmentchar
            alignposition.Responsiveness = 200
            alignposition.Parent = clone

            local alignorientation = Instance.new("AlignOrientation")
            alignorientation.MaxTorque = 25000
            alignorientation.Attachment0 = attatchmenthalo
            alignorientation.Attachment1 = attatchmentchar
            alignorientation.Responsiveness = 200
            alignorientation.Parent = clone

            clone.Parent = char
            return "yes"
        end
    end
end

game.ReplicatedStorage.Remotes.EquipHalo.OnServerInvoke = equipHalo