Not our ref problem with Hugo Academic

[bshor]

Hello, I’m getting an inexplicable build error in my Hugo Academic site that references "themes/academic". This was triggered by a submodule change in Hugo Academic I believe. On the Hugo forums they suggested that gcushen/hugoacademic is a long-dead repo.

Here are the details.

Domain and site name: research.bshor.com
Github repository: GitHub - bshor/website

Here’s the error:

3:48:43 PM: Starting to prepare the repo for build
3:48:43 PM: Preparing Git Reference refs/heads/master
3:48:44 PM: Error pulling repository
3:48:44 PM: Failing build: Failed to prepare repo
3:48:44 PM: Failed during stage 'preparing repo': From https://github.com/bshor/website
 * branch            master     -> FETCH_HEAD
   325e39a..a55963c  master     -> origin/master
Fetching submodule themes/academic
fatal: remote error: upload-pack: not our ref d87b8ddce142ce3ac76b86bcf9106255c8c5ef10
Errors during submodule fetch:
	themes/academic
: exit status 1

And a screenshot:

Any ideas?