Nginx Can't create staging site

Hi! I tried creating a staging site by using a www2.demo.com sub domain but I get the following error. I already have demo.com running on the same server.

Code:

Feb 27 18:35:10 demo.demo systemd[1]: Unit nginx.service entered failed state.
Feb 27 18:35:10 demo.demo systemd[1]: nginx.service failed.
Feb 27 18:35:10 demo.demo systemd[1]: Starting SYSV: Nginx is an HTTP(S) server, HTTP(S) reverse proxy and IMAP/POP3 proxy server...
Feb 27 18:35:10 demo.demo nginx[2142]: Starting nginx: nginx: [emerg] duplicate listen options for 0.0.0.0:443 in /usr/local/nginx/conf/conf.d/www2.demo.com.ssl.conf:11
Feb 27 18:35:10 demo.demo nginx[2142]: [FAILED]
Feb 27 18:35:10 demo.demo systemd[1]: nginx.service: control process exited, code=exited status=1
Feb 27 18:35:10 demo.demo systemd[1]: Failed to start SYSV: Nginx is an HTTP(S) server, HTTP(S) reverse proxy and IMAP/POP3 proxy server.

Pls advice.

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I'm afraid I don't understand what's reuseport directive.
Do let me know what info you need so I can post it here

nginx -t

Code:

nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful

 

Finally got it working. You're right. I had another site using the "listen 443 ssl http2 reuseport;" and I removed it.
Now my new site is working.
Thanks!