Couldn't find a package.json

Im here - Create an App
Everything works till bench start and ./env/bin/pip install -q -U -e ./apps/library_management
but at yarn I get package.json not found.

% yarn run v1.22.19
yarn run v1.22.19
error Couldn't find a package.json file in "/Users/username/workspace/erpnext/frappe-bench"
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.