Why cant i sit in the car when its cloned?

I made a button, that clones your car in front of you. But if i clone it in studio, it works but in game i cant sit in it. whats the problem?

script:

local debounce = false
local plr = game.Players.LocalPlayer
script.Parent.MouseButton1Click:Connect(function()
       if not debounce then
	for i,v in pairs(game.Players.LocalPlayer.Character:GetChildren()) do
		if v:IsA("Model") then
		v:Destroy()
		end
	end
	wait(0.1)
		 local car = plr.SelectedCar.Value:Clone()
		car.Parent = game.Players.LocalPlayer.Character
		car.Name = plr.Name..("'s Car")
		car:SetPrimaryPartCFrame(plr.Character.Head.CFrame * CFrame.new(0,0,-10))
		car:MakeJoints()
		debounce = true
		wait(1)
		debounce = false
	end
end)