Error: The "svgbob" preprocessor exited unsuccessfully with exit status: 1 status

[elasticdotventures]

I had this working earlier on a very basic mdbook, then I added a bunch of content and now I'm stuck here -- beginning investigation, and will post as I try.

repo is here: https://github.com/elasticdotventures/fungiblefarm-dots

2022-06-08 14:46:33 [INFO] (mdbook::book): Book building has started [2022-06-08T04:46:33Z ERROR mdbook_svgbob] Unable to parse the input 2022-06-08 14:46:33 [WARN] (mdbook::preprocess::cmd): Error writing the RenderContext to the backend, Broken pipe (os error 32) 2022-06-08 14:46:33 [ERROR] (mdbook::utils): Error: The "svgbob" preprocessor exited unsuccessfully with exit status: 1 status