JavaScript jQuery assistance needed to add infinite scroll and masonry plugins tumblr

General information for the website: Tumblr blog site
Kind of development: Customization of existing website
Description of requirements/features: I have a client site which I have been working on for a long time, which is giving me a headache, and I don't have time to try and fix the issue myself.

The client is using a theme which utilises the Masonry plugin (posts are rendered and then placed on the page according to browser dimensions, resizing and so on).

The client also wants to enhance this by installing infinite scroll. I have both versions of the plugins running (in fact masonry has never been a problem), but there is a console error returning for infinite scroll. I seem to recall that it could be to do with a version issue of infinite scroll, but it might be that my js syntax is not quite correct.

There is absolutely no rush for this job, but I would like a developer who understands the issue and is able to communicate it to me. There will be debugging and research involved (quite alot has been posted about this issue on Stack Overflow).

You may also need to take advantage of an imagesLoaded function.

The current theme needs to be installed on your own tumblr account so you can test this (most of the assets are pointing to static tumblr url or my own dropbox, so you may need to host files for testing, but my suspicion is that the only error is in the custom inline script in the footer, I think the callback function). The full html is added to this job below.

I would like to understand the fix myself and I can't pay the earth, but I would appreciate the assistance.

Any questions please ask, but in your bid.
Extra notes: Test tumblr is here:
http://kod-temp.tumblr.com/