[Choonstertwo]

I'm getting a "Fetching failed with status 128" error when forcing an update on one of my AddOns.

Full log:

Jul 08 08:38:14 choonster-wow-addons heroku/router:  at=info method=GET path="/force/CustomTooltips/1.04" host=choonster-wow-addons.herokuapp.com request_id=dad177d4-2d6f-4f4e-a4ab-7305333f23eb fwd="220.239.127.236" dyno=web.1 connect=2ms service=83ms status=304 bytes=131 
Jul 08 08:38:14 choonster-wow-addons app/web.1:  [LOG.1] Work order #1 started 
Jul 08 08:38:14 choonster-wow-addons app/web.1:  [LOG] Received forced check for "CustomTooltips" version "1.04". 
Jul 08 08:38:15 choonster-wow-addons app/web.1:  [LOG.1] Found tag link on CurseForge. 
Jul 08 08:38:15 choonster-wow-addons app/web.1:  [LOG.1] Found file link on CurseForge. 
Jul 08 08:38:15 choonster-wow-addons app/web.1:  [LOG.1] Successfully downloaded file from CurseForge. 
Jul 08 08:38:16 choonster-wow-addons app/web.1:  [LOG.1] Successfully authenticated with WowInterface. 
Jul 08 08:38:16 choonster-wow-addons app/web.1:  [LOG.1] Attempting to fetch changelog from path "CHANGELOG.md". 
Jul 08 08:38:16 choonster-wow-addons app/web.1:  [LOG.1] Found existing addon, previous version: "1.03". 
Jul 08 08:38:19 choonster-wow-addons app/web.1:  [LOG.1] Changelog fetched successfully from path "CHANGELOG.md". 
Jul 08 08:38:19 choonster-wow-addons app/web.1:  [ERR.1] Error: Fetching failed with status 128.

AddOn Packager Proxy: 0.5.1
addons.json: https://gist.github.com/Choonster/2ce79d3eb7adee8bdb2d

Do you know what the issue might be?