Update problem - yarn install in VM virtual image

In develop
the
bench update --reset
works with the long log as above.

the
bench update
comes with this log:

frappe@erpnext:~/frappe-bench$ bench update
INFO:bench.utils:updating bench
INFO:bench.utils:git pull
Already up-to-date.
INFO:bench.utils:./env/bin/pip install Pillow
Requirement already satisfied: Pillow in ./env/lib/python2.7/site-packages
Requirement already satisfied: olefile in ./env/lib/python2.7/site-packages (from Pillow)


Cannot proceed with update: You have local changes in app "frappe" that are not committed.

Here are your choices:

1. Merge the frappe app manually with "git pull" / "git pull --rebase" and fix conflicts.
1. Temporarily remove your changes with "git stash" or discard them completely
	with "bench update --reset" or for individual repositries "git reset --hard"
2. If your changes are helpful for others, send in a pull request via GitHub and
	wait for them to be merged in the core.
frappe@erpnext:~/frappe-bench$ 

Is this normal?