nginx.service failure

Hi there! Trying to get nginx up and running for a pleroma instance. I was initially working off of this guide: https://docs.pleroma.social/debian_based_en.html#content. I’ve tried a bunch of things from around the internet to solve the problem of nginx just not wanting to be started, I’ll try to accurately enumerate them.

sudo service nginx start

returns

Job for nginx.service failed because the control process exited with error code.
See "systemctl status nginx.service" and "journalctl -xe" for details.

systemctl status nginx

returns

 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 Thu 2019-07-18 19:46:13 UTC; 11min ago
     Docs: man:nginx(8)
  Process: 8665 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=1/FAILURE)

nginx -t

returns

nginx: [warn] the "user" directive makes sense only if the master process runs with super-user privileges, ignored in /etc/nginx/nginx.conf:1
nginx: [emerg] BIO_new_file("/etc/letsencrypt/live/sweetjams.club/fullchain.pem") failed (SSL: error:02001002:system library:fopen:No such file or directory:fopen('/etc/letsencrypt/live/sweetjams.club/fullchain.pem','r') error:2006D080:BIO routines:BIO_new_file:no such file)
nginx: configuration file /etc/nginx/nginx.conf test failed

the error.log file shows basically the same thing;

2019/07/18 20:07:57 [emerg] 8939#8939: BIO_new_file("/etc/letsencrypt/live/sweetjams.club/fullchain.pem") failed (SSL: error:02001002:system library:fopen:No such file or directory:fopen('/etc/letsencrypt/live/sweetjams.club/fullchain.pem','r') error:2006D080:BIO routines:BIO_new_file:no such file)

A common problem appears to be apache or something else using ports 80 or 440, I’ve already ensured that that is not the case here. It seems like I’ve got a .pem file missing, but tbh I don’t know what that is or where it should be or how to get one. So. Can anyone help me?