What is wrong in this script?

model = script.Parent.Parent.Parent.CarSeat.Value.Parent.Parent

function onclick ()
	sell = script.Parent.Parent.Parent.sell.Value
	local stats = game.Players.LocalPlayer:FindFirstChild("leaderstats")
	if stats ~= nil then
		local cash = stats:FindFirstChild("Money")
		cash.Value = cash.Value + sell
		script.Parent.Parent.Parent:Destroy()
		script.Parent.Parent.Parent.Parent.Parent.Parent:remove()
	end
	
end

script.Parent.MouseButton1Click:connect(onclick)

it says: 00:01:16.443 - Players.Player.PlayerGui.Screen.Frame.TextButton.Script:10: attempt to index field 'Parent' (a nil value) 00:01:16.444 - Script 'Players.Player.PlayerGui.Screen.Frame.TextButton.Script', Line 10