attempt to index field 'Parent' (a nil value) How do i fix this?

There is an error at line 9. I am trying to make a tool that give cash and that is the fill of the tool. I hope you understand me.

local prog = 0
local Give = workspace.Events.Give
local Player = game.Players.LocalPlayer
local fillv = game.ReplicatedStorage.Fillit
local x =   script.Parent.Parent.Parent
Player.Backpack.Cash1.Activated:Connect(function()
    while wait(.1) do
    prog = prog + 10
    script.Parent.Size = UDim2.new(prog/100, 0, 0, 65)
    script.Parent.Text = ("Filling...")
    if prog == 100 then
        wait(0.34)
        fillv.Value = false
       x:Destroy()
    end
    end
end)