GroupDocs.Comparison Test not working

I am trying to test the groupdocs.comparison pdf no code app and have uploaded 2 simple pdf files (attached here). I then see a blank page, never loading a comparison of the 2 files, and there is a “big bad 500” error in the console as well

diff pdfs ver 1.pdf (18.6 KB)

diff pdfs ver 2.pdf (18.4 KB)

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