CANT ROLL ball when attached. What do i do??? [closed]

function AttachBall(part,ball)

    local Attacher = Instance.new("WeldConstraint",part)

    Attacher.Part0 = part

    Attacher.Part1 = ball

end

local Character = script.Parent

local RootPart = Character:WaitForChild("UpperTorso") or Character:WaitForChild("Torso")

local Ball = Instance.new("Part",Character)

Ball.Shape = Enum.PartType.Ball

Ball.Size = Vector3.new(8,8,8)

Ball.CFrame = RootPart.CFrame

AttachBall(RootPart,Ball)

Ball.Anchored = false

Character.PrimaryPart = RootPart

Character:WaitForChild("HumanoidRootPart"):Destroy()

it wont roll when the person controls pls help