Why the pop up billboard Gui not showing when approaching?

My code is like this, it should work! When the distance between Local Player and the noticePad, the GUI will show.

--Codes above is ignored.
while wait() do
    for i,Notice in pairs(BillBoards) do
        local NoticePad = Notice.PrimaryPart
        local dist = (plr.Character.HumanoidRootPart.Position - NoticePad.Position).magnitude
        if dist <= 30 then --It works! But it is not visible >:(
            script.Parent.Parent.Adornee = NoticePad
            script.Parent.Parent.Enabled = true
            script.Parent.Visible = true
            script.Parent.Nearby:Fire(NoticePad)
        else
            script.Parent.Parent.Enabled = false
        end
    end
end

Please help me, sincerely.

DERP9487

:)))))))