I am using Dropbox to sync a git repository, but now when I try and push I am getting an error:
fatal: Reference has inval
The conflicted file could be in multiple places, I would look into:
.git/logs/refs/remotes/origin/
.git/logs/refs/heads/
.git/refs/remotes/origin/
.git/refs/heads/
Or you might look everywhere in the .git subdirectory: find . -name '*conflicted*'
Or, otherwise, list the active branches with git branch -a and delete (git branch -d) anything suspicious.