Nginx with a domain and subdomain

Hi guys,

First timer configuring nginx here, hope you can help me.

I have my domain, let’s say www.example.com. And I have my app, which I would like to run on app.example.com

www.example.com will be running a behind a wordpress web server and appe.example.com will be running behind a nodejs server.

So this is my ngnix config file:

server {
        listen 80;
        server_name example.com www.example.com;
        root /var/www/html;

        # Add index.php to the list if you are using PHP
        index index.html index.htm index.nginx-debian.html;

        server_name example.com;

        location / {
                # First attempt to serve request as file, then
                # as directory, then fall back to displaying a 404.
                try_files $uri $uri/ =404;
        }

}
server {
        listen 80;
        server_name app.example.com;

        location / {
                proxy_pass http://localhost:3000;
                proxy_set_header Host $host;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_connect_timeout 150;
                proxy_send_timeout 100;
                proxy_read_timeout 100;
                proxy_buffers 4 32k;
                client_max_body_size 8m;
                client_body_buffer_size 128k;
        }
}

when I run ngnix -t I get:

root@ubuntu-1gb-sgp1-01:/etc/nginx/conf.d# nginx -t nginx: [warn] conflicting server name “example.com” on 0.0.0.0:80, ignored nginx: the configuration file /etc/nginx/nginx.conf syntax is ok nginx: configuration file /etc/nginx/nginx.conf test is successful

What am I doing wrong?

Thank you