error: failed to push some refs

My co-worker received an error message when trying to do a push to our git repos. Usually a pull will fix the issue in my experience but this was different.

Error Message

git.exe push --progress  "origin" branchName:branchName

error: Couldn't set refs/heads/branchName To X:\xxx.git  ! branchName -> branchName (failed to write)

error: failed to push some refs to 'X:\xxx.git'

Resolution

To resolve, we had to run some clean-up/performance commands on the remote repository.

Commands

git fsck --unreachable
git reflog expire --expire=0 --all
git repack -a -d -l
git prune
git gc --aggressive