Bench start error js and css not found

Hello every one, I am using Ubuntu 14.04v , when i put bench start command then console error is required resources are not loaded, and i get erpnext desk without css and js .
i have tried following command but not use, so please any one help me
i have install erp using Manual Install and Easy Install script
bench build,
bench update
bench clear-cache
also clear browser cache
bench clear-browser-cache
curl -sL | sudo -E bash -
sudo apt-get install -y nodejs
bench setup socketio
bench setup redis
bench setup supervisor
bench start
bench setup redis-async-broker
bench setup redis …
sudo bench disable-production
run bench setup sudoers frappe
also format laptop still same proble1

console Error is : Failed to load resource: the server responded with a status of 404 (NOT FOUND)
16:29:27 watch.1 | Rebuilding rollup.manifest.css
16:29:27 watch.1 | Rebuilding frappe-web.min.js
not found

Search for rollup in the forum