Hi Ryan,
> Any idea what the issue here is or how I should go about debugging? You were *so* close! The problem is with the license field. Uncharacteristically, we are using spdx-string->license here, so “expat” is not a valid license name. When you replace it with “MIT” it will work. I’ll change this to use the Guixy license names first, and only fall back to SPDX names when that fails. And there should be a proper error message, of course. Thanks for the bug report! -- Ricardo