parent is not a valid member of Model? plzz help

It says "parent is not a valid member of Model"

	for _, object in pairs(game.ServerStorage:GetChildren()) do
		local CarCopy = object:clone()
		CarCopy.parent = game.Workspace
		CarCopy:MakeJoints()
	end

I want to make the CarCopy to go in to the Workspace from my ServerStorage but it is not doing it here is all the scripts in that one script

local RespawnCarsBlock = game.Workspace.RestartCars


function RespawnCars()
	print("Cars is respawning!")
	
	for _, object in pairs(game.Workspace:GetChildren()) do
		print(object.name)
		if object.name == "Motorcycle" then
			print("this is a Motorcycle we need to destroy it!")
			object:destroy()
		end
	end
	
	for _, object in pairs(game.ServerStorage:GetChildren()) do
		local CarCopy = object:clone()
		CarCopy.parent = game.Workspace
		CarCopy:MakeJoints()
	end
	
	
	
	
end


RespawnCarsBlock.Touched:connect(RespawnCars())