Thought I would add since I didn't in my original post, I'm using Mercurial on this addon (and all of my addons). Sounds like it's more an issue with the packager and less with the versioning system since it sounds like Proteyer and arith are both using SVN.
I've got mercurial version 3.7.3 running. I'm trying to push 4 commits to the remote. The commit changes include adding one new sub-folder and file, renaming (moving) a few existing files, and a few edits on existing files.
This is the repo:
the specific error is
hg push --new-branch default
pushing to https://repos.curseforge.com/wow/prospect-me/
searching for changes
abort: HTTP Error 500: Internal Server Error
Completed with errors, see above