BUG: Error when pressing "Download PDF" in export section

[Fullchee]

SVG files are created in the courseography folder (which is the folder where I run stack exec courseography)

A PDF is also generated but is mostly blank except for the SVG files names (except instead of ending with .svg, it ends with .png)

I get this behaviour on the https://courseography.cdf.toronto.edu site as well.

Preliminary Debugging
In export.js.jsx in the getPDF(), the $.ajax fails and returns an error