Can you give me more context on the error? They usually start with a chain of script references, revealing where the error was thrown. My guess offhand would be that PIL is being finicky about something in the file naming or path listing, but I can only guess about what's happening without more information. PIL throws some weird errors, I've noticed.

Okay, second guess. There's something PIL considers odd about your file's internal formatting. Maybe.

More information would help me figure out what's going on.

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.