Nginx Proxy Manager Let's Encrypt Certificate Internal Error Message

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My domain is: maniejv.duckdns.org

I ran this command:

  1. Within Nginx Proxy Manager, I selected Add SSL Certificate
  2. Under Domain Names, I placed *.maniejv.duckddns.org
  3. Selected 'Use a DNS Challenge'
  4. I selected DuckDNS as my DNS Provider
  5. I replaced your-duckdns-token with the token provided by DuckDNS
  6. I selected 'I Agree to the Let's Encrypt Terms'
  7. I selected 'Save'

It produced this output:

CommandError: WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/certbot-dns-duckdns/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/certbot-dns-duckdns/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/certbot-dns-duckdns/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/certbot-dns-duckdns/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/certbot-dns-duckdns/
ERROR: Could not find a version that satisfies the requirement certbot-dns-duckdns~=1.0 (from versions: none)
ERROR: No matching distribution found for certbot-dns-duckdns~=1.0

at /app/lib/utils.js:16:13
at ChildProcess.exithandler (node:child_process:430:5)
at ChildProcess.emit (node:events:518:28)
at maybeClose (node:internal/child_process:1104:16)
at ChildProcess._handle.onexit (node:internal/child_process:304:5)

My web server is (include version): Synology NAS - Docker - Container Manager

The operating system my web server runs on is (include version): Synology DSM 7.2

My hosting provider, if applicable, is: DuckDNS

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

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

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