Cartographer error

Since the latest WoW patch every time i log on i get an error message, cartographer still works as far as the coords go.. which is why i use it. It just gets irritating having to click ok on the message which reads as follows: ...ns\cartographer\lobAbacus-3.0\LibAbacus-3.0.lug:24: attempt to index global ' copper ' ( a nil value }

                OKAY

is there a fix for this? I have uninstalled curse and all addons and deleted the backup folder and then installed it again and the same thing happens same error message. PLEASE HELP!!