Unable to start bench in ubuntu14.04

i installed new bench and site, have installed app after i run bench start(i didnt get any output)after
i run bench serve --port 8000, we are getting below error.please help on this

172.16.1.133 - - [09/Jul/2018 13:20:54] “GET / HTTP/1.1” 200 -
172.16.1.133 - - [09/Jul/2018 13:20:54] “GET /assets/erpnext/css/website.css HTTP/1.1” 200 -
172.16.1.133 - - [09/Jul/2018 13:20:54] “GET /assets/frappe/css/bootstrap.css HTTP/1.1” 200 -
172.16.1.133 - - [09/Jul/2018 13:20:54] “GET /assets/frappe/js/lib/jquery/jquery.min.js HTTP/1.1” 200 -
172.16.1.133 - - [09/Jul/2018 13:20:54] “GET /assets/frappe/js/lib/bootstrap.min.js HTTP/1.1” 200 -
172.16.1.133 - - [09/Jul/2018 13:20:56] “GET /website_theme.css HTTP/1.1” 200 -
172.16.1.133 - - [09/Jul/2018 13:20:56] “GET /website_script.js HTTP/1.1” 200 -
172.16.1.133 - - [09/Jul/2018 13:20:58] “GET /assets/js/erpnext-web.min.js HTTP/1.1” 404 -
172.16.1.133 - - [09/Jul/2018 13:20:58] “GET /assets/js/frappe-web.min.js HTTP/1.1” 404 -
172.16.1.133 - - [09/Jul/2018 13:20:58] “GET /assets/css/frappe-web.css HTTP/1.1” 404 -
172.16.1.133 - - [09/Jul/2018 13:20:59] “GET /assets/js/frappe-web.min.js HTTP/1.1” 404 -
172.16.1.133 - - [09/Jul/2018 13:21:01] “GET /assets/js/erpnext-web.min.js HTTP/1.1” 404 -
172.16.1.133 - - [09/Jul/2018 13:21:01] “GET /assets/erpnext/images/favicon.png HTTP/1.1” 200 -
172.16.1.133 - - [09/Jul/2018 13:21:02] “GET /login HTTP/1.1” 200 -
172.16.1.133 - - [09/Jul/2018 13:21:04] “GET /website_script.js HTTP/1.1” 200 -
172.16.1.133 - - [09/Jul/2018 13:21:04] “GET /website_theme.css HTTP/1.1” 200 -
172.16.1.133 - - [09/Jul/2018 13:21:06] “GET /assets/css/frappe-web.css HTTP/1.1” 404 -
172.16.1.133 - - [09/Jul/2018 13:21:06] “GET /assets/js/frappe-web.min.js HTTP/1.1” 404 -
172.16.1.133 - - [09/Jul/2018 13:21:06] “GET /assets/js/erpnext-web.min.js HTTP/1.1” 404 -
172.16.1.133 - - [09/Jul/2018 13:21:08] “GET /assets/js/frappe-web.min.js HTTP/1.1” 404 -
172.16.1.133 - - [09/Jul/2018 13:21:09] “GET / HTTP/1.1” 200 -
172.16.1.133 - - [09/Jul/2018 13:21:11] “GET /website_script.js HTTP/1.1” 200 -
172.16.1.133 - - [09/Jul/2018 13:21:11] “GET /website_theme.css HTTP/1.1” 200 -
172.16.1.133 - - [09/Jul/2018 13:21:11] “GET /assets/js/erpnext-web.min.js HTTP/1.1” 404 -
172.16.1.133 - - [09/Jul/2018 13:21:14] “GET /assets/js/frappe-web.min.js HTTP/1.1” 404 -
172.16.1.133 - - [09/Jul/2018 13:21:14] “GET /assets/css/frappe-web.css HTTP/1.1” 404 -
172.16.1.133 - - [09/Jul/2018 13:21:14] “GET /assets/js/erpnext-web.min.js HTTP/1.1” 404 -
172.16.1.133 - - [09/Jul/2018 13:21:15] “GET /assets/js/frappe-web.min.js HTTP/1.1” 404 -
172.16.1.133 - - [09/Jul/2018 13:21:16] “GET /assets/js/erpnext-web.min.js HTTP/1.1” 404 -

Hello @ashok.
Unfortunately I don’t think anyone will be able to help with the information you have provided. You’ll need to send more information.
The most that is visible from what you show, is that you seem to have a permissions error.
Did you install as user “frappe”, using sudo commands?

“after i run bench start(i didnt get any output)”

Yup best to give us your command line input too for eg.

frappe@erpnext:~/frappe-bench$ ls -al .
total 40
drwxrwxr-x 8 frappe frappe 4096 Nov 28 2016 .
drwxr-xr-x 12 frappe frappe 4096 Jun 28 15:20 …
drwxrwxr-x 6 frappe frappe 4096 Nov 27 2016 apps
drwxrwxr-x 3 frappe frappe 4096 Apr 19 2016 config
drwxrwxr-x 9 frappe frappe 4096 Apr 19 2016 env
drwxrwxr-x 2 frappe frappe 4096 Dec 21 2016 logs
drwxrwxr-x 7 frappe frappe 4096 Apr 19 2016 node_modules
-rw-rw-r-- 1 frappe frappe 888 Nov 28 2016 Procfile
-rw-rw-r-- 1 frappe frappe 775 Apr 19 2016 Procfile~
drwxrwxr-x 5 frappe frappe 4096 Jul 4 16:36 sites

We have resolved the above issue, Thaq So much to all.