you didn’t put , after 33, cords.x, cords.y and cords.z so this is an error on your code
and I think you don’t need that Client before CreateThread

this is the code :

CreateThread(function()
		while true do
			Citizen.Wait(1)
			local cords = vector3(-931.94, -3181.99, 12.94)
			DrawMarker(
				33,
				cords.x,
				cords.y,
				cords.z,
				0.0,
				0.0,
				0.0,
				0.0,
				0.0,
				0.0,
				2.0,
				2.0,
				2.0,
				255,
				255,
				255,
				255,
				false,
				true,
				2,
				nil,
				nil,
				true
			)
		end
	end
)

and this is your marker :