nginx error “page is temporarily unavailable”

I’ve SSH installed a Python 3.5 application on CentOS along with uwsgi and nginx, but after doing a sudo vi /etc/nginx/nginx.conf to edit the nginx config file as per usual, the response is currently:

nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

these are the contents of the /etc/nginx/nginx.conf file:

sendfile            on;
tcp_nopush          on;
tcp_nodelay         on;
keepalive_timeout   65;
types_hash_max_size 2048;

include             /etc/nginx/mime.types;
default_type        application/octet-stream;

include /etc/nginx/conf.d/*.conf;

server {
    listen      [::]:80 default_server;
    server_name  _;
    root         /var/www/html/<directory//;

    location / {
    }

The server is currently showing an nginx error page