install Adminer on a Nginx server running Ubuntu OS on it

I am trying to install Adminer as per the documentation in https://gist.github.com/zloynemec/1e4680c4c9aa9cee8a6e#file-adminer_setup-sh

When I run the **service nginx start **command, I get the

Job for nginx.service failed because the control process exited with error code.
``` error

Running the ```systemctl status nginx.service```command shows the following logs. The url http://165.227.197.220/ and http://165.227.197.220/adminer both work but they do not show the Adminer login screen. What am I missing?

● nginx.service - A high performance web server and a reverse proxy server
   Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Mon 2019-09-02 22:45:19 UTC; 12s ago
     Docs: man:nginx(8)
  Process: 29238 ExecStart=/usr/sbin/nginx -g daemon on; master_process on; (code=exited, status=1/FAILURE)
  Process: 29449 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=1/FAILURE)

systemd[1]: Starting A high performance web server and a reverse proxy server...
nginx[29449]: nginx: [emerg] open() "/etc/nginx/global/restrictions.conf" failed (2: No such file or directory) in /etc/nginx/sites-
nginx[29449]: nginx: configuration file /etc/nginx/nginx.conf test failed
systemd[1]: nginx.service: Control process exited, code=exited status=1
systemd[1]: nginx.service: Failed with result 'exit-code'.
systemd[1]: Failed to start A high performance web server and a reverse proxy server.
...skipping...
● nginx.service - A high performance web server and a reverse proxy server
   Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Mon 2019-09-02 22:45:19 UTC; 12s ago
     Docs: man:nginx(8)
  Process: 29238 ExecStart=/usr/sbin/nginx -g daemon on; master_process on; (code=exited, status=1/FAILURE)
  Process: 29449 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=1/FAILURE)

systemd[1]: Starting A high performance web server and a reverse proxy server...
nginx[29449]: nginx: [emerg] open() "/etc/nginx/global/restrictions.conf" failed (2: No such file or directory) in /etc/nginx/sites-
nginx[29449]: nginx: configuration file /etc/nginx/nginx.conf test failed
systemd[1]: nginx.service: Control process exited, code=exited status=1
systemd[1]: nginx.service: Failed with result 'exit-code'.
systemd[1]: Failed to start A high performance web server and a reverse proxy server.