Cannot load certificate

[Hejfi]

root@Ubuntu-2004-focal-64-minimal /var/www/forum # tail -f /var/log/nginx/error.log
2020/11/09 16:11:07 [emerg] 130349#130349: cannot load certificate "/etc/letsencrypt/live/forum.skillhouserp.pl/fullchain.pem": BIO_new_file() failed (SSL: error:02001002:system library:fopen:No such file or directory:fopen('/etc/letsencrypt/live/forum.skillhouserp.pl/fullchain.pem','r') error:2006D080:BIO routines:BIO_new_file:no such file)
2020/11/09 16:11:43 [emerg] 130353#130353: cannot load certificate "/etc/letsencrypt/live/forum.skillhouserp.pl/fullchain.pem": BIO_new_file() failed (SSL: error:02001002:system library:fopen:No such file or directory:fopen('/etc/letsencrypt/live/forum.skillhouserp.pl/fullchain.pem','r') error:2006D080:BIO routines:BIO_new_file:no such file)
2020/11/09 16:12:41 [notice] 130382#130382: signal process started
2020/11/09 16:12:45 [notice] 130398#130398: signal process started
2020/11/09 16:12:48 [notice] 130407#130407: signal process started
2020/11/09 16:14:02 [notice] 130468#130468: signal process started
2020/11/09 16:16:34 [alert] 130469#130469: *260 open socket #15 left in connection 5
2020/11/09 16:16:34 [alert] 130469#130469: aborting
2020/11/09 16:20:48 [notice] 130751#130751: signal process started
2020/11/09 16:20:49 [notice] 130760#130760: signal process started

[jillian]

In order to provide help, we will need more information about what is causing that error. Importantly, is this your first attempt to get a certificate or are you attempting renewal.

Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. https://crt.sh/?q=example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My domain is:

I ran this command:

It produced this output:

My web server is (include version):

The operating system my web server runs on is (include version):

My hosting provider, if applicable, is:

I can login to a root shell on my machine (yes or no, or I don't know):

I'm using a control panel to manage my site (no, or provide the name and version of the control panel):

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):

[rg305]

Please also add the output of:
certbot certificates