I contacted Johannes Beigel and he recommended I submit this question
here, he also provided a few questions that I will attempt to answer.

I have installed MediaWiki on a private server and am attempting to
use mw-zip to fetch the articles/images I need to render a PDF of the
selected articles. The issue I am having is that the images are simply
not being downloaded and the error I have been receiving when
attempting to render the book is:

rlwriter.warning >> invalid image url (obj.target: u'File:Mars global
surveyor.jpg')

As a result the book renders successfully, but without any images.
When manually executing mw-zip the resulting zip file has an empty
imageInfo.json file, and no images are downloaded. I manually ran mw-
zip and pointed it at en.wikipedia.org and it successfully grabbed all
images and loaded them into the zip file. However, if I point it at my
local installation, this does not occur. Images are stored in the
images/thumb folder. As a result I'm 95% sure the issue must be with
my MediaWiki server / API.

We are running mwlib/mwrl/mediawiki on an Ubuntu machine.

Version 0.12.5 for mwlib.rl
Version 0.12.3 for mwlib
Version 1.16.0 of MediaWiki

Johannes Asked me:
Are images retrievable by the MediaWiki API?

I don't know what API calls are used by Mw-Zip in order to fetch
images, I looked at the API but I don't see any call that lists the
URLs of all images that appear on a certain page - could you please
point me in the right direction so I can answer this question
correctly?

Is there any relevant log output when you try to use mw-zip to create
the ZIP file manually?

I use the -l parameter and point it to a log file, the only out put I
see it this:

1%  creating nuwiki in u'tmp_W4KUv/nuwiki'

removing tmpdir u'tmp_W4KUv'

Once again, an empty images.json file and no images in the zip file!
Please help me!!

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