Okay, I am messing up horribly now. I put the 'elementtree' folder in with the pdfread.py file, and that didn't make those "Element" warnings go away.
Also, there were no PNG files in the temp directory. And I couldn't figure out how to make that change in the code, I keep getting weird errors. It would probably be best for you to upload the changed code for me to try.
Sorry to bother you with this!