Adv Dup Error

[Captain Maim]

weapons/gmod_tool/stools/adv_duplicator.lua742:attempt to call field existes(a ni value)

What's this mean?
And how should I advise fixing it?

My friend got adv dup and wire from www.glua.net. Put it in addons. Wire works he says but adv dup doesn't.

[Squeakyneb]

First, get SVN.
second, that copy of duper is corrupted, delete it.

[Jat Goodwin]

Seeing all the adv dupe problem threads makes me think that it (adv dupe) should have its own part of the forum.

[Captain Maim]

I tried that copy of advanced dup, works fine. Swapped it out for my SVN copy. Not that SVN has changed that copy in... Well at least since I got Garry's mod which was at the start of the summer.