Nignx404 Error

usernginx;
worker_processes1;
pid/var/run/nginx.pid;

events {
    worker_connections1024;
}
US>http{
    include/etc/nginx/mime.types;
    default_type application/octet-stream;

    root/var/www/html;

    log_format main'$remote_addr-$remote_user[$time_local]"$request"'
                      '$status$body_bytes_sent"$http_refer"'
                      '''$http_user_agent''''$http_x_forwarded_for";

    access_log/var/log/nginx/access.log main;
    error_log/var/log/nginx/error.log debug;

    sendfile on;

    keepalive_timeout65;

    # Configuring for Top Domains    
    include/etc/nginx/conf.d/top.conf;

    # Configuring for Subdomains
    include /etc/nginx/conf.d/subdomain name.conf;

server{
    listen80; 
    server_name domain.com;
    charset UTF-8;

    location / {
      root/var/www/html;
      index index.html index.html index.php;
    }

    error_page500502503504/50x.html;

    location=/50x.html{
        root/usr/share/nginx/html;
    }

    location~\.php${
        root/var/www/html;
        fastcgi_pass 127.0.0.1:9000;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME$ document_root$fastcgi_script_name;
        include fastcgi_params;
    }
}

 error_log/var/www/ directory name for subdomain /current/log/nginx.error.log;
access_log/var/www/subdomain directory name/current/log/nginx.access.log;

client_max_body_size2G;
upstream app_server{
  # Path to socket of cooperating unicorn
  server unix: /var/www/ directory name for subdomain /current/tmp/sockets/.unicorn.sock;
}

server{
  listen443 ssl;
  server_name subdomain name.com;
  keepalive_timeout5;
  root/var/www/ directory name for subdomain /current/public;

try_files$uri/index.html$uri.html$uri@app;
  location@app{
    # HTTP heads
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;
    # proxy_pass http://127.0.0.1:3000;
    proxy_pass http://app_server;
  }

  error_page500502503504/500.html;
  location=/500.html{
    root/var/www/ directory name for subdomain /current/public;
  }
}