Erpnext not install

1

Screenshot from 2017-12-12 12-48-47
Screenshot from 2017-12-12 12-48-471920×1080 297 KB

ERPNEXT not install by typing sudo bench --site portfolio.local install-app erpnext

getting error
show in screenshot

2

Read this, should get you up to speed

https://jwrober.github.io/erpnext_admin_guide/i-u-b/install