Domains Changed domain name, can;t restart nginx

I have followed this guide Nginx - Insight Guide - How to change a site's domain name with HTTPS and Letsencrypt SSL Certificate? to change the domain name however when I try to restart nginx it fails with this error.

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Code:

Restarting php-fpm (via systemctl) [  OK  ]
[14:20][root@herald addons]# nprestart
Restarting nginx (via systemctl):  Job for nginx.service failed because the control process exited with error code. See "systemctl status nginx.service" and "journalctl -xe" for details.

 

I get this....

Code:

nginx: [emerg] open() "/usr/local/nginx/conf/ssl/newdomain.co.uk/newdomain.co.uk.crt.key.conf" failed (2: No such file or directory) in /usr/local/nginx/conf/conf.d/newdomain.co.uk.                                                 ssl.conf:15
nginx: configuration file /usr/local/nginx/conf/nginx.conf test failed

 

The crt.key.conf is missing for some reason.

 

I have fixed the missing file problem and I can now restart Nginx.

I am now getting an HTTP 500 error trying to access the new domain.