Enable ModSecurity error nginx: [emerg] "try_files" directive Rule id: 254 is duplicated

Today, I installed mod_security for nginx. I added the following block to

server {
        listen 80;
        server_name mydomain.com;

        modsecurity on;
        modsecurity_rules_file /etc/nginx/modsec/main.conf;

        location / {
                proxy_pass http://10.0.1.54:8002;
        }

After restarting Nginx, I got the following error:

nginx: [emerg] "try_files" directive Rule id: 254 is duplicated
 in /etc/nginx/nginx.conf:62
nginx: configuration file /etc/nginx/nginx.conf test failed

What is going wrong? how to fix it? This guide installed is here: https://www.tecmint.com/install-modsecurity-nginx-debian-ubuntu/