You made a changes to the config files probably.
Go to your
oh-my-zsh directory and type in
Results for me (i've changed one of the themes):
╭─ jane ~
╰─ λ cd .oh-my-zsh 1:57:10
╭─ jane ~/.oh-my-zsh ‹master*›
╰─ λ git status 1:57:17
On branch master
Your branch is up-to-date with 'origin/master'.
Changes not staged for commit:
(use "git add <file>..." to update what will be committed)
(use "git checkout -- <file>..." to discard changes in working directory)
no changes added to commit (use "git add" and/or "git commit -a")
You will see that some files have been modified.
You can type in
git stash to temporarily get rid of those changes, and attempt updating again.