Printer Addon Making an error, shipments arent working!

Hey so im making a darkrp server, i know like a bit of lua, but when i saw the code on the server i was done, fully done. xD.

Anyways, i had just finished installing some custom printers here: http://steamcommunity.com/sharedfiles/filedetails/?id=308267896&searchtext=DarkRP.

It worked fine with no errors, then out of the blue, i was trying to get shipments working and then this error pops up!

SHIPMENTS DONT WORK! AND I DONT KNOW HOW TO FIX THIS HELP!!! Thanks -Muffin

help?