Turn on warnings, strict and diagnostics and try again. I'll bet perl will give you a few hints.
Update: Ignore this. They were turned on, and I missed 'em.
Reading through the error chain, it seems that the problem might be that main::setImage is passing PDF::API2::image_png an invalid object. (The hint I'm working from is the 'undefined' argument in multiple call levels...)
...roboticus
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