Nginx container returning an error with Exit code 1 [emerg] 1#1: unknown directive "enable" in /etc/nginx/nginx.conf:45

I have 2 servers one is on the Digital ocean the other is somewhere else. I have one project and it is working well with all apps on that server. But, I wanted to create a droplet and move it to the digital ocean so I was copied all files to the new server(digital ocean) via sudo scp command. All services are working well except Nginx is returning Exit code 1. The whole codes are the same so I am so confused why it is not working as the other.

May I know what might I am missing?

it is my nginx.conf file :

worker_processes 4;
    
    events {
      worker_connections 4096;
    }
    
    http {
    
      server {
        listen 80 default_server;
        server_name "";
        return 444;
      }
    
      server {
        server_name game-dev.myappapp.com;
    
        location / {
          proxy_set_header X-Real-IP $remote_addr;
          proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
          proxy_set_header Host $http_host;
          proxy_set_header X-NginX-Proxy true;
          proxy_http_version 1.1;
          proxy_set_header Upgrade $http_upgrade;
          proxy_set_header Connection "upgrade";
    
          proxy_pass http://game_nodes;
          proxy_redirect off;
        }
      }
      server {
        if ($host = game-dev.myappapp.com) {
          return 301 https://$host$request_uri;
        }
    
    
        listen 80;
        listen [::]:80;
        server_name game-dev.myappapp.com;
        return 404;
      }
    
      upstream game_nodes {
        # enable sticky session
        #ip_hash;
        server game-alpha:3000;
        keepalive 8;
      }
    
      server {
        server_name api-dev.myappapp.com;
    
        location / {
          proxy_set_header X-Real-IP $remote_addr;
          proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
          proxy_set_header Host $http_host;
          proxy_set_header X-NginX-Proxy true;
    
          proxy_pass http://main_nodes;
          proxy_redirect off;
    
        }
      }
    
      server {
        if ($host = api-dev.myappapp.com) {
          return 301 https://$host$request_uri;
        }
    
        listen 80;
        listen [::]:80;
        server_name api-dev.myappapp.com;
        return 404;
      }
    
      upstream main_nodes {
        server main-alpha:8000;
        server main-beta:8000;
        keepalive 8;
      }
    }

it is my Dockerfile :

FROM nginx
COPY nginx.conf /etc/nginx/nginx.conf

As you can see from below (the left one server is my droplet, the right one is my other server) my droplet is not listening to 80 port normally it should listen as the other server.

my other server:

root@cihatserver:/home/cihat/app# netstat -plant | grep 80

output is: tcp6 0 0 :::80 :::* LISTEN 15696/docker-proxy

my droplet :

root@knowin-project-dev:/home/cihat/app# netstat -plant | grep 80

output is: –empty–

This is my Nginx log.

root@knowin-project-dev:/home/cihat/app# docker logs nginx
/docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
/docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
/docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
10-listen-on-ipv6-by-default.sh: info: Getting the checksum of /etc/nginx/conf.d/default.conf
10-listen-on-ipv6-by-default.sh: info: Enabled listen on IPv6 in /etc/nginx/conf.d/default.conf
/docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh
/docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh
/docker-entrypoint.sh: Configuration complete; ready for start up
2021/06/13 20:22:46 [emerg] 1#1: unknown directive "enable" in /etc/nginx/nginx.conf:45
nginx: [emerg] unknown directive "enable" in /etc/nginx/nginx.conf:45

Note: ufw’s status is inactive. So all ports are available.