keystonejs styles and admin pages not loaded

Hi , I have a nodejs application based on keystone. NodeJs and MongoDB installation run successfully but i am getting this styles error when trying to open the app

Errors /styles/themes/Bootstrap.min.css Request Method: GET Status Code: 404 Not Found

t/styles/site.css Request Method: GET Status Code: 404 Not Found

NginX configuration

    location / {
    proxy_redirect off;
    proxy_set_header X-NginX-Proxy true;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_pass http://localhost:8080;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection 'upgrade';
    proxy_set_header Host $host;
    proxy_cache_bypass $http_upgrade;
            # First attempt to serve request as file, then
            # as directory, then fall back to displaying a 404.
            try_files $uri $uri/ =404;
    }