The error is interesting, but I don't know the API that is being relied upon here. I think this is reverse-engineered stuff going on as Poser never officially supported user-defined XML dialogs. The entire old UI was written this way, but now has all been replaced. I suspect that this kind of complex UI has to be re-implemented in wx.

Leaving the subject of Python script problems aside, what is the problem that is solved by this script? Is it so you can make a full body morph from the currently modified figure?

If so, is it not easier to just use the new PP2012 menu item Figure/Create Full Body Morph?

(There are many new things in Poser that make a lot of scripts completely pointless. Always learn the new features before you set about updating a script that no longer fills a gap.)

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)