nginx - codeigniter gives white screen -

i creating web app using nginx , codeigniter, when install codeigniter project give white screen

checks

1) nginx installed because shows default page says "welcome", 2) phpfpm installed because file shows phpinfo(); worked perfectly,

but when have installed codeigniter project shows blank screen or white screen.

nginx default

server {     listen 80 default_server;     listen [::]:80 default_server ipv6only=on;      root /srv/www/vishalnlabz.com/public_html;     index index.php index.html index.htm;      server_name 104.131.57.74;      location / {             try_files $uri $uri/ /index.php;     }     location ~ \.php$ {             #fastcgi_split_path_info ^(.+\.php)(/.+)$;             include /etc/nginx/fastcgi_params;             #fastcgi_pass 127.0.0.1:9000;             if ($uri !~ "^/images/") {                     fastcgi_pass unix:/var/run/php5-fpm.sock;             }             fastcgi_index index.php;             fastcgi_param script_filename /srv/www/vishalnlabz.com/public_html$fastcgi_script_name;     }     location ~ /\.ht {             deny all;     } } 

try turning on notices , errors in code:

error_reporting(e_all); ini_set('display_errors', true); ini_set('display_startup_errors', true);